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List of Freshwater Fishes reported from Viet Nam
n = 768
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Table 1: 732 species currently present in the country/island (endemic, native, introduced, reintroduced);
Table 2: 29 species possibly present in the country/island (stray, questionable);
Table 3: 7 species demonstrated to be absent in the country/island (extirpated, not established, misidentification, error).
Table 4: 768 species reported from the country/island altogether.
Table 1: 732 species currently present in the country/island.
     
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Family Species Author Info Occurrence Common names Abundance Max length Maturity Remark Photo
Gobionidae Abbottina binhi Nguyen, 2001 Fr native    Type locality, Cao Bàng, Cao Bàng (Ref. 56787).  No picture yet.
Cobitidae Acanthopsoides namromensis Nguyen, 2005 Fr native    Found in Dien Bien (Ref. 84796).  No picture yet.
Cobitidae Acantopsis dialuzona Van Hasselt, 1823 Fr native  Cá chia voi (Vietnamese)  25.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 4832, 7050, 36654. 
Cobitidae Acantopsis rungthipae Boyd, Nithirojpakdee & Page, 2017 Fr native   11.97 cm SL male/unsexed  Known from Mekong River basin (Ref. 116755).  No picture yet.
Gobiidae Acentrogobius caninus (Valenciennes, 1837) Fr, Br, M native  Cá Bống răng chó (Vietnamese), Cá Bống tro (Vietnamese), Tropical sand goby (English)  18.30 cm TL male/unsexed  Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416); also from Nha Trang (Ref. 58534). 
Acheilognathidae Acheilognathus barbatulus Günther, 1873 Fr native   8.70 cm TL male/unsexed  Known from the northern Viet Nam. 
Acheilognathidae Acheilognathus deignani (Smith, 1945) Fr native   5.20 cm SL male/unsexed  Reported from Song Boi in Hoa Binh Province (Ref. 44416). 
Acheilognathidae Acheilognathus elongatoides Kottelat, 2001 Fr native   9.80 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Type locality, Thuong R., Lang Son, n. Vietnam (Ref. 46206). Also Ref. 94476.  No picture yet.
Acheilognathidae Acheilognathus fasciodorsalis Nguyen, 2001 Fr native    Type locality, Sông Bàng, Cao Bàng, Cao Bàng Prov. (Ref. 56787).  No picture yet.
Acheilognathidae Acheilognathus imfasciodorsalis Nguyen, 2001 Fr native    Type locality, Cao Bàng, Cao Bàng Prov. (Ref. 56787).  No picture yet.
Acheilognathidae Acheilognathus kyphus (Mai, 1978) Fr native    Known from northern Vietnam (Ref. 44416). The type locality of this species seems uncertain. It is known to be in creeks in northern Thailand (Ref. 97102). Kottelat 2013 (Ref. 94476) indicated that the type locality is in creeks in northern Vietnam, but this is probably in Ky Phu stream, Dai Tu District in Thai Nguyen Province.  No picture yet.
Acheilognathidae Acheilognathus longibarbatus (Mai, 1978) Fr native   9.20 cm SL male/unsexed  Kown from northern Vietnam (Ref. 44416). Type locality, Na-Ri R. and Cao Bang River, northern Viet Nam (Ref. 33021). Also Ref. 43281.  No picture yet.
Acheilognathidae Acheilognathus macropterus (Bleeker, 1871) Fr native   27.50 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Acheilognathidae Acheilognathus nguyenvanhaoi Nguyen, Tran & Ta, 2013 Fr native    Found in Tien Yen River in Binh Lieu town, Quang Ninh Province (Ref. 94476).  No picture yet.
Acheilognathidae Acheilognathus polyspinus (Holcík, 1972) Fr native    Known only from northern Vietnam (Ref. 44416). Found in Red River (Hong Bo) near Hanoi and Day River, Hoa Binh Province (Ref. 94476).  No picture yet.
Acheilognathidae Acheilognathus tonkinensis (Vaillant, 1892) Fr native   12.20 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Found in Da River (Ref. 90167, 89724). Also Ref. 43281, 94476. 
Cyprinidae Acrossocheilus aluoiensis (Nguyen, 1997) Fr native    Type locality, Upstream of Sê Kông R., Mekong R. system, A Luoi district, Thua Thien, Hue, Vietnam, 16°15'32N, 107°13'31E, elev. 469 m (Ref. 50838).  No picture yet.
Cyprinidae Acrossocheilus baolacensis Nguyen, 2001 Fr native    Type locality, Nho Quê, Bao Lac, Cao Bàng (Ref. 56787).  No picture yet.
Cyprinidae Acrossocheilus iridescens (Nichols & Pope, 1927) Fr native   29.70 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Known from the Red River basin (Ref. 43281). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Acrossocheilus lamus (Mai, 1978) Fr native    Known from Lam River in northern Vietnam (Ref. 44416). Also Ref. 94476.  No picture yet.
Cyprinidae Acrossocheilus macrophthalmus Nguyen, 2001 Fr native    Type locality, Da River at Thac Bo, Da Bac district, Hoa Binh Province (Ref. 94476).  No picture yet.
Cyprinidae Acrossocheilus microstoma (Pellegrin & Chevey, 1936) Fr native    Known from Nam So, a tributary of Black River at Ban Mun, Tonkin (Ref. 94476).  No picture yet.
Cyprinidae Acrossocheilus yalyensis Nguyen, 2001 Fr native    Type locality, Sông Sesan, Kon Tum (Ref. 56787).  No picture yet.
Akysidae Akysis clavulus Ng & Freyhof, 2003 Fr native   3.50 cm SL male/unsexed  Known only from Cai and Duc My rivers, which drain to the central Vietnamese coast and enter the sea in Nha Trang and Ninh Hoa, respectively (Ref. 52824). 
Cyprinidae Albulichthys albuloides (Bleeker, 1855) Fr, Br native   30.00 cm SL male/unsexed  Known from the Mekong basin. Also Ref. 7050, 2091, 43281. 
Cyprinidae Altigena lippa (Fowler, 1936) Fr native   28.40 cm SL male/unsexed  Type locality of Sinilabeo brevirostris, Lai Châu Prov., Sông Nâm Rôm, Diên Biên, and Sinilabeo longirostris, Lai Chau Prov., Dien Bien district [now Province]: Nam Rom River [Mekong basin] (Ref. 94476).  No picture yet.
Cyprinidae Altigena tonkinensis (Pellegrin & Chevey, 1934) Fr, Thr native  Cá Hoả (Vietnamese)   Found in northern Vietnam (Ref. 44416). Known from Ba Be Lake (Ref. 46453). Type locality, river Ngoi-Thia at Nghia Lô, tributary of Hong R., upstream of Yên Bay. Also stated as Labeo graffeuilli in Ref. 46452. Present in Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452).  No picture yet.
Ambassidae Ambassis kopsii Bleeker, 1858 Fr, Br, M native  Cá Sơn biển kôp si (Vietnamese), Freckled hawkfish (English) occasional (usually not seen) 10.20 cm TL male/unsexed  Found in the Mekong delta (Ref. 12693), Gulf of Tonkin and central Vietnam (Ref. 12846); also from Nha Trang (Ref. 58534). 
Ambassidae Ambassis vachellii Richardson, 1846 Fr, Br, M native   6.50 cm SL male/unsexed  Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). 
Cyprinidae Amblyrhynchichthys micracanthus Ng & Kottelat, 2004 Fr native   19.67 cm SL male/unsexed   
Cyprinidae Amblyrhynchichthys truncatus (Bleeker, 1850) Fr native  Cá trao tráo (Vietnamese)  40.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 7050, 36654. 
Anabantidae Anabas testudineus (Bloch, 1792) Fr, Br native  Cá ro dong (Vietnamese), Cá Rô đồng (Vietnamese), Cá rô dông (Vietnamese)  25.00 cm TL male/unsexed  Found in Hanoi, northern Vietnam (Ref. 44416). Occurs in the Mekong basin (Ref. 27732). Present in Da River (Ref. 90167, 89724). Also Ref. 2682, 36625, 37770. 
Xenocyprididae Ancherythroculter daovantieni (Bănărescu, 1967) Fr native    Known from northern Vietnam (Ref. 44416). Type locality, Boi R., n. Vietnam (Ref. 46206).  No picture yet.
Cyprinidae Anematichthys repasson (Bleeker, 1853) Fr native  Cá ba ky tráng (Vietnamese)  28.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 2091. 
Anguillidae Anguilla japonica Temminck & Schlegel, 1846 Fr, Br, M, Thr native  Cá chình Nhật (Vietnamese) scarce (very unlikely) 150 cm TL male/unsexed  Found in central Vietnam (Ref. 9706) and northern Viet Nam (Ref. 44416). Also Ref. 2682. Status of threat: Endangered (Ref. 46452). 
Anguillidae Anguilla marmorata Quoy & Gaimard, 1824 Fr, Br, M, Thr native  Cá chình (Vietnamese) scarce (very unlikely) 70.00 cm TL male/unsexed ;200 cm TL female  Found in Central Vietnam (Ref. 9706). Recorded from the Mekong basin (Ref. 43281). Present in Dakrong River (Ref. 89722). Also Ref. 44416. Status of threat: Rare (Ref. 46452). 
Gastromyzontidae Annamia normani (Hora, 1931) Fr native   7.80 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 43281. 
Gastromyzontidae Annamia thuathienensis Nguyen, 2005 Fr native    Found in Thua Thiên, Huê (Ref. 84796). 
Xenocyprididae Aphyocypris dorsohorizontalis (Nguyen & Doan, 1969) Fr native    Type locality, Ha Bac Province (Ref. 50838).  No picture yet.
Xenocyprididae Aphyocypris kyphus (Mai, 1978) Fr native    Type locality, Ky-Phú Creek and Câu R., Cho-Moi, Hòa-Binh, northern Vietnam (Ref. 50838). Present in Da River (Ref. 90167, 89724).  No picture yet.
Xenocyprididae Aphyocypris normalis Nichols & Pope, 1927 Fr native  Cá Dẫm dẫt suỗi (Vietnamese)  10.00 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Aplocheilidae Aplocheilus panchax (Hamilton, 1822) Fr, Br native  Cá bac dâu (Vietnamese), Cá Bạc đầu (Vietnamese)  9.00 cm TL male/unsexed  .Found in Mekong delta (Ref. 36625). Also Ref. 27139, 36654. 
Xenocyprididae Araiocypris batodes Conway & Kottelat, 2008 Fr native   3.32 cm SL male/unsexed ;3.05 cm SL female  Type locality, Quang Ninh Province, Hai Ninh District, forest creek near Khay Rau village, 10 km on road from bac Phong Sinh to Mong Cai, ZRC 50942 (holotype of Araiocypris batodes, 3.32 cm SL, male) (Ref. 75046).  No picture yet.
Gobiidae Aulopareia unicolor (Valenciennes, 1837) Fr, Br native   10.74 cm TL male/unsexed   
Tetraodontidae Auriglobus modestus (Bleeker, 1850) Fr native  Cá nóc vàng (Vietnamese)  10.60 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Tetraodontidae Auriglobus nefastus (Roberts, 1982) Fr native   13.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Gobiidae Awaous melanocephalus (Bleeker, 1849) Fr, Br native   15.00 cm TL male/unsexed   
Sisoridae Bagarius lica Volz, 1903 Fr native  Cá Chiên (Vietnamese)  200 cm SL male/unsexed  Known from the Red River basin in Hanoi and Mekong basin in Can Tho (Ref. 35669). Present in Da River (Ref. 90167, 89724). Also Ref. 2091, 37770. 
Sisoridae Bagarius rutilus Ng & Kottelat, 2000 Fr native   100.00 cm SL male/unsexed  Known from the Red River drainage (Ref. 37037). Also Ref. 43281, 44416.  No picture yet.
Bagridae Bagrichthys macropterus (Bleeker, 1854) Fr native  Cá chot chuoi (Vietnamese), Cá Chốt cớ (Vietnamese)  30.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Bagridae Bagrichthys obscurus Ng, 1999 Fr native   24.91 cm SL male/unsexed  Known from Basaac River adjacent to Dong Phu in Phong Dinh Province. 
Cyprinidae Balantiocheilos melanopterus (Bleeker, 1850) Fr native  Cá hoc tro (Vietnamese)  35.00 cm SL male/unsexed  Known from the Mekong River. Also Ref. 43281. 
Balitoridae Balitora haithanhi Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Balitoridae Balitora kwangsiensis (Fang, 1930) Fr native   12.00 cm TL male/unsexed  Occurs in the Red River basin (Ref. 43281) in northern Vietnam (Ref. 44416). 
Balitoridae Balitora lancangjiangensis (Zheng, 1980) Fr native   7.10 cm SL male/unsexed  Found in Red River.  No picture yet.
Balitoridae Balitora nigrocorpa Nguyen, 2005 Fr native    Found in Hà Giang (Ref. 84796).  No picture yet.
Balitoridae Balitora vanlani Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Balitoridae Balitora vanlongi Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Cyprinidae Barbichthys laevis (Valenciennes, 1842) Fr native  Cá ba luoi (Vietnamese)  31.00 cm TL male/unsexed  Found in the Mekong basin (Ref. 36625, 43281). Also Ref. 36654. 
Cyprinidae Barbodes aurotaeniatus (Tirant, 1885) Fr native   9.00 cm TL male/unsexed  Occurs in the Mekong basin. Also Ref. 36625, 43281. 
Cyprinidae Barbodes binotatus (Valenciennes, 1842) Fr native   20.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also known from Annam (Ref. 26580). Also Ref. 36654. 
Cyprinidae Barbodes semifasciolatus (Günther, 1868) Fr native   7.00 cm TL male/unsexed  Known from Hanoi, northern Vietnam (Ref. 44416). Also found in Annam basin (Ref. 26580). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Barbonymus altus (Günther, 1868) Fr, Aq native  Cá he vàng (Vietnamese)  25.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Cultured in floating cages (Ref. 12693). 
Cyprinidae Barbonymus balleroides (Valenciennes, 1842) Fr native   30.00 cm TL male/unsexed   
Cyprinidae Barbonymus gonionotus (Bleeker, 1849) Fr native  Cá mè vinh (Vietnamese), Cá trà vinh (Vietnamese)  43.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 1739. 
Cyprinidae Barbonymus schwanefeldii (Bleeker, 1854) Fr native  Cá he do (Vietnamese)  35.00 cm SL male/unsexed  Found in the Mekong basin. Also Ref. 36654, 27732. 
Barbuccidae Barbucca elongata Vasil'eva & Vasil'ev, 2013 Fr native   3.40 cm TL male/unsexed  Known from Cua Can River system (Ref. 93745).  No picture yet.
Gastromyzontidae Beaufortia fasciolata Nguyen, 2005 Fr native    Found in Cao Bang (Ref. 84796).  No picture yet.
Gastromyzontidae Beaufortia leveretti (Nichols & Pope, 1927) Fr native   12.00 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Gastromyzontidae Beaufortia multiocellata Nguyen, 2005 Fr native    Found in Cao Bang (Ref. 84796).  No picture yet.
Gastromyzontidae Beaufortia pingi (Fang, 1930) Fr native   5.00 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724).  No picture yet.
Gastromyzontidae Beaufortia triocellata Nguyen, 2005 Fr native    Found in Cao Bang (Ref. 84796).  No picture yet.
Siluridae Belodontichthys truncatus Kottelat & Ng, 1999 Fr, Br native  Cá trèn rang (Vietnamese)  60.00 cm SL male/unsexed  Known from the Mekong River drainage. Also Ref. 38432. 
Osphronemidae Betta pugnax (Cantor, 1849) Fr native   6.73 cm SL male/unsexed   
Osphronemidae Betta splendens Regan, 1910 Fr native  Cá lia thia (Vietnamese)  6.50 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Sciaenidae Boesemania microlepis (Bleeker, 1858) Fr, Br native  Ca suu (Vietnamese)  100.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281); also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). Also Ref. 36654. 
Oxudercidae Boleophthalmus boddarti (Pallas, 1770) Fr, Br, M native  Cá Lác bo đa (Vietnamese), Cá Lác bô đa (Vietnamese), Boddart's goggle-eyed goby (English), Cá bong sao (Vietnamese), Cá Thòi Lòi (Vietnamese)  22.00 cm TL male/unsexed 11.52 TL Found in Mekong delta (Ref. 36625). Also Ref. 7050. 
Butidae Bostrychus sinensis Lacepède, 1801 Fr, Br, M, Thr native  Cá Bống bớp (Vietnamese), Four-eyed sleeper (English)  22.00 cm SL male/unsexed  Found in Hanoi, northern Vietnam (Ref. 44416); also from Quang Ninh-Cat Ba (Ref. 58534). Status of threat: Vulnerable (Ref. 46452). 
Soleidae Brachirus panoides (Bleeker, 1851) Fr native  Cá luoi mèo (Vietnamese)  20.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625); reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Soleidae Brachirus siamensis (Sauvage, 1878) Fr native   15.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281).  No picture yet.
Gobiidae Brachygobius doriae (Günther, 1868) Fr native  Cá bong mát tre (Vietnamese)  4.20 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Not in Ref. 43716. 
Butidae Butis butis (Hamilton, 1822) Fr, Br, M native  Cá Bống cấu (Vietnamese), Cá Bống đầu dẹp (Vietnamese), Duckbill sleeper (English), Cá bong trân (Vietnamese)  15.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625), Quang Ninh-Cat Ba and Nha Trang (Ref. 58534). 
Butidae Butis koilomatodon (Bleeker, 1849) Fr, Br, M native  Cá Bống răng cưa (Vietnamese)  10.70 cm TL male/unsexed  Known from Mekong delta (Ref. 12693) and Quang Ninh-Cat Ba (Ref. 58534). 
Danionidae Cabdio morar (Hamilton, 1822) Fr introduced   20.00 cm NG male/unsexed  Known from northern Vietnam (Ref. 44416). 
Cyprinidae Carassioides acuminatus (Richardson, 1846) Fr native  Cá Nhung (Vietnamese)   Found in northern Vietnam (Ref. 44416). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Carassioides argentea Nguyen, 2001 Fr native    Type locality, Sông Hàn TP, Dà Nãng (Ref. 56787).  No picture yet.
Cyprinidae Carassioides macropterus Nguyen, 2001 Fr native    Type locality, Sông Hàn TP, Dà Nãng (Ref. 56787).  No picture yet.
Cyprinidae Carassioides phongnhaensis Nguyen & Ho, 2003 Fr native    Recorded from Phong Nha, Song Son in Quang Binh (Ref. 94476).  No picture yet.
Cyprinidae Carassius auratus (Linnaeus, 1758) Fr introduced  Cá Diếc (Vietnamese)  48.00 cm TL male/unsexed  Known from northern Vietnam, but status needs critical reevaluation (Ref. 44416). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 1739, 43281, 84795. 
Carcharhinidae Carcharhinus leucas (Valenciennes, 1839) Fr, Br, M native  Cá Mập lơ - ca (Vietnamese)  360 cm TL male/unsexed ;400 cm TL female   
Tetraodontidae Carinotetraodon lorteti (Tirant, 1885) Fr native   6.00 cm SL male/unsexed   
Cyprinidae Catlocarpio siamensis Boulenger, 1898 Fr, Fi native  Trey krawhao (Khmer), Cá Hô (Vietnamese), Trey kolriang (Khmer), Trey kromawl (Khmer), Ca ho (Vietnamese), Cá ho (Vietnamese) common (usually seen) 300 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Encountered all year round in many areas of the Mekong basin (Ref. 37770). Juveniles are encountered at Can Tho in Can Tho Province and at Cao Lanh in Dong Thap Province in the Mekong and also in some canals (Ref. 37770). Also Ref. 36654, 43281. 
Ariidae Cephalocassis borneensis (Bleeker, 1851) Fr native  Cá úc mim (Vietnamese) occasional (usually not seen) 30.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Known from Phuquoc Islands (Ref. 9706). Also Ref. 36654, 43281. 
Cyprinidae Ceratogarra cambodgiensis (Tirant, 1883) Fr native   24.00 cm TL male/unsexed  Known from the Mekong basin. Also Ref. 43281. 
Channidae Channa asiatica (Linnaeus, 1758) Fr native   23.50 cm TL male/unsexed  Known from the Red River basin of northern Vietnam (Ref. 43157). Present in Da River (Ref. 90167, 89724). 
Channidae Channa gachua (Hamilton, 1822) Fr native  Cá chanh duc (Vietnamese)  32.90 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Also found in the Mekong basin (Ref. 27732). Also Ref. 43281. 
Channidae Channa hoaluensis Nguyen, 2011 Fr native   25.50 cm SL female  Found in Ninh Binh province (Ref. 91062).  No picture yet.
Channidae Channa longistomata Nguyen, Nguyen & Nguyen, 2012 Fr native   15.60 cm TL male/unsexed  Found in provinces of Da river basin (Dien Bien, Lai Chau, Son La and Hoa Binh) and distributed in lakes near regions of lime mountains of Ha Nam and Ninh Binh (Ref. 91065).  No picture yet.
Channidae Channa lucius (Cuvier, 1831) Fr native  Cá day (Vietnamese)  53.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 36654, 43281. 
Channidae Channa maculata (Lacepède, 1801) Fr native  Cá Chuối hoa (Vietnamese)  20.00 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 559. Status of Threat: Endangered (Ref. 89724). 
Channidae Channa marulius (Hamilton, 1822) Fr native   183 cm TL male/unsexed   
Channidae Channa melasoma (Bleeker, 1851) Fr native   30.00 cm SL male/unsexed   
Channidae Channa micropeltes (Cuvier, 1831) Fr native  Cá bong (Vietnamese), Cá Lóc bông (Vietnamese)  130 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 4835, 36625, 36654. 
Channidae Channa ninhbinhensis Nguyen, 2011 Fr native   26.70 cm SL male/unsexed ;27.50 cm SL female  Found in Ninh Binh province (Ref. 91062). 
Channidae Channa orientalis Bloch & Schneider, 1801 Fr native   33.00 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Channidae Channa striata (Bloch, 1793) Fr native  Cá Ló, cá Sộp (Vietnamese), Cá lòc (Vietnamese), Cá quả (Vietnamese), Cá lót (lóc) (Vietnamese), cá Sộp (Vietnamese), Cá träu (Vietnamese)  100.00 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Also found in the Mekong basin (Ref. 36625). Also Ref. 27732. 
Xenocyprididae Chanodichthys erythropterus (Basilewsky, 1855) Fr native  Cá Thiểu (Vietnamese)  102 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Xenocyprididae Chanodichthys mongolicus (Basilewsky, 1855) Fr native   100.00 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416).  No picture yet.
Chanidae Chanos chanos (Fabricius, 1775) Fr, Br, M native  Cá Măng biển (Vietnamese), Bony salmon (English), Milkfish (English), Cá Máng (Vietnamese) common (usually seen) 180 cm SL male/unsexed ;124 cm SL female  Occurs in the Mekong River, mostly in the delta (Ref. 12693). Found in Central Vietnam (Phuyen, Khanhhoa). Common at Khanhhoa, Phuyen. But seldom abundant (Ref. 9706). Also Ref. 2682. 
Chaudhuriidae Chaudhuria caudata Annandale, 1918 Fr native   6.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Notopteridae Chitala ornata (Gray, 1831) Fr native   100.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 43281. 
Tetraodontidae Chonerhinos naritus (Richardson, 1848) Fr native   28.50 cm TL male/unsexed   
Cyprinidae Cirrhinus cirrhosus (Bloch, 1795) Fr, Fi, Ft introduced  Cá Mrigan (Vietnamese), Trôi trắng (Vietnamese)  100.00 cm SL male/unsexed  Feral individuals have been found at several localities during the 1999 survery of the Lo River (Ref. 44416). Fifty 5-6 months old (50 g) fingerlings introduced to Vietnam under the International Network on Genetics in Aquaculture (INGA) (Ref. 12338). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Cirrhinus jullieni Sauvage, 1878 Fr, Br native  Cá linh ong (Vietnamese), Cá Linh ống (Vietnamese)  20.00 cm SL male/unsexed  Known from the Mekong River (Ref. 12693, 43281). Also Ref. 36654. 
Cyprinidae Cirrhinus microlepis Sauvage, 1878 Fr native   65.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 33488). Undertakes dowstream migration in the Mekong Delta, consisting mainly juveniles of sizes between 2 and 20 cm, with the smallest fish mainly in June-July while sizes from 10-20 cm in September to November (Ref. 37770). Also Ref. 27732. 
Cyprinidae Cirrhinus molitorella (Valenciennes, 1844) Fr, Fi native  Cá linh ria (Vietnamese), CáTrôi Việt (Vietnamese)  55.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Found in Red River (Ref. 27732) and Mekong basin (Ref. 36625, 43281). Present in Da River (Ref. 90167, 89724). Recorded as having been or being farmed in rice fields (Ref. 119549). 
Clariidae Clarias fuscus (Lacepède, 1803) Fr native  Cá Trê đen (Vietnamese)  24.50 cm SL male/unsexed  Reported from Ky Cung, Lang Son and Vu Quang in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 43281. 
Clariidae Clarias gariepinus (Burchell, 1822) Fr introduced  Cá Trê Phi (Vietnamese)  170 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Clariidae Clarias gracilentus Ng, Hong & Tu, 2011 Fr native    Found in Phu Quoc Island (Ref. 86814). 
Clariidae Clarias macrocephalus Günther, 1864 Fr native  Cá trê vàng (Vietnamese)  120 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 36654, 43281. 
Clariidae Clarias meladerma Bleeker, 1846 Fr native   35.00 cm SL male/unsexed  Occurs in the Mekong delta. Also Ref. 43281. 
Clariidae Clarias nieuhofii Valenciennes, 1840 Fr native   50.00 cm TL male/unsexed   
Dorosomatidae Clupanodon thrissa (Linnaeus, 1758) Fr, Br, M, Thr native  Cá Mòi cớ hoa (Vietnamese) common (usually seen) 26.00 cm SL male/unsexed  Known from the Gulf of Tonkin (Ref. 9706) and Quang Ninh-Cat Ba (Ref. 58534). Also Ref. 188, 44416. Status of threat: Vulnerable (Ref. 46452). 
Ehiravidae Clupeichthys goniognathus Bleeker, 1855 Fr native   12.00 cm TL male/unsexed   
Ehiravidae Clupeoides borneensis Bleeker, 1851 Fr native   8.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Reported from Song Hau Giang, a branch of the Mekong River also known as the Bassac River (Ref. 87929). Also Ref. 188. 
Ailiidae Clupisoma sinense (Huang, 1981) Fr native   31.00 cm SL male/unsexed   
Cobitidae Cobitis arenae (Lin, 1934) Fr native   8.01 cm SL male/unsexed  Known from Hong River basin in northern Viet Nam (Ref. 44416). Identification needs confirmation (Ref. 44416).  No picture yet.
Cobitidae Cobitis guttata (Nguyen, 2005) Fr native    Found in Hà Giang (Ref. 84796). Also Ref. 92804, 94476.  No picture yet.
Cobitidae Cobitis laoensis (Sauvage, 1878) Fr native  Cá Chạch hoa Lào (Vietnamese)  10.60 cm SL male/unsexed  Present in Dakrong River (Ref. 89722).  No picture yet.
Cobitidae Cobitis longitaeniatus Ngô, 2008 Fr native      No picture yet.
Cobitidae Cobitis nuicocensis Nguyen & Vo, 2005 Fr native    Found in Thái Nguyên (Ref. 84796).  No picture yet.
Cobitidae Cobitis phongnhaensis Ngô, 2008 Fr native      No picture yet.
Cobitidae Cobitis squataeniatus Ngô, 2008 Fr native      No picture yet.
Cobitidae Cobitis taenia Linnaeus, 1758 Fr introduced   13.50 cm TL male/unsexed ;9.50 cm SL female  Present in Da River (Ref. 90167, 89724). 
Cobitidae Cobitis ylengensis Ngô, 2003 Fr native    Type locality, Bai Dinh, Town Dan Hoa, Minh Hoa, Quang Binh Province (Ref. 85815).  No picture yet.
Engraulidae Coilia grayii Richardson, 1845 Fr, Br, M native  Cá Lành canh trắng (Vietnamese), Cá mào gà tráng (Vietnamese) common (usually seen) 33.00 cm SL male/unsexed  Known from the Gulf of Tonkin, Southern Vietnam (Ref. 9706) and northern Vietnam (Ref. 44416). Found in Mekong delta (Ref. 36625). Also Ref. 189. 
Engraulidae Coilia lindmani Bleeker, 1857 Fr, Br, M native  scarce (very unlikely) 20.00 cm SL male/unsexed  Known from Southern Vietnam (Ref. 9706); reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). Also Ref. 189, 36654. 
Engraulidae Coilia mystus (Linnaeus, 1758) Fr, Br, M native  Cá Lành canh đuôi phượng (Vietnamese), Phoenix-tailed anchovy (English) common (usually seen) 21.00 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416), the Gulf of Tonkin and Southern Vietnam (Ref. 9706); also from Quang Ninh-Cat Ba (Ref. 58534). 
Engraulidae Coilia reynaldi Valenciennes, 1848 Fr native  Cá mào gà (Vietnamese)  15.00 cm TL male/unsexed   Found in Mekong delta (Ref. 36625). 
Sinipercidae Coreoperca whiteheadi Boulenger, 1900 Fr native   21.80 cm SL male/unsexed  Found in northern Vietnam. Present in Da River (Ref. 90167, 89724). 
Ehiravidae Corica soborna Hamilton, 1822 Fr native   5.30 cm TL male/unsexed  Reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Cyprinidae Cosmochilus harmandi Sauvage, 1878 Fr native  Cá duòng bay (Vietnamese)  100.00 cm TL male/unsexed  Known from the Mekong River. Also Ref. 36654, 43281. 
Cranoglanididae Cranoglanis bouderius (Richardson, 1846) Fr, Thr native  Cá Ngạnh (Vietnamese)  43.00 cm SL male/unsexed  Status of threat: Vulnerable (Ref. 46452). 
Cranoglanididae Cranoglanis caolangensis Nguyen, 2005 Fr native    Found in Cao Bang (Ref. 84796).  No picture yet.
Cranoglanididae Cranoglanis henrici (Vaillant, 1893) Fr native   28.97 cm SL male/unsexed  Known from the Red River drainage in northern Vietnam. Collected from Rivière Noire [Song Da], Tonkin; also from Hoa Binh market, Hoa Binh Prov.; Phu Tho-Bai Bang-Lam Tao area, Vinh Phu Prov.; Cho Gao market, about 3 km from Hung Yen, Hai Hung Prov.; and, Market in Hanoi (Ref. 44364). Also Ref. 44416. 
Cranoglanididae Cranoglanis songhongensis Nguyen, 2005 Fr native    Found in Ha Noi (Ref. 84796).  No picture yet.
Cyprinidae Crossocheilus cobitis (Bleeker, 1854) Fr native   14.80 cm TL male/unsexed  Known from the Mekong basin (Ref. 43281). Also Ref. 12693. 
Cyprinidae Crossocheilus reticulatus (Fowler, 1934) Fr native  Cá nút (Vietnamese)  17.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 36625, 43281. 
Xenocyprididae Ctenopharyngodon idella (Valenciennes, 1844) Fr introduced  Cá châm Treng (Vietnamese), Cá Trắm cỏ (Vietnamese), Trắm cỏ (Vietnamese)  150 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 1739. 
Xenocyprididae Culter flavipinnis Tirant, 1883 Fr native  Yellowfin culter (English), Cá ngão (Vietnamese), Cá Ngão gù (Vietnamese)   Known from Annam (Ref. 26580). Type locality, Hue (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Cyclocheilichthys apogon (Valenciennes, 1842) Fr native  Cá ba ky do (Vietnamese), Cá Ba kỳ đỏ (Vietnamese), Cá Cóc đậm (Vietnamese)  28.70 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also known from Annam (Ref. 26580). Also Ref. 7050, 36654. 
Cyprinidae Cyclocheilichthys armatus (Valenciennes, 1842) Fr native   23.00 cm SL male/unsexed   
Cyprinidae Cyclocheilichthys enoplos (Bleeker, 1849) Fr native  Cá coc (Vietnamese), Cá Cóc (Vietnamese)  74.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 7050, 37770, 43281. 
Cyprinidae Cyclocheilichthys heteronema (Bleeker, 1854) Fr native   12.00 cm SL male/unsexed   
Cynoglossidae Cynoglossus microlepis (Bleeker, 1851) Fr native   32.50 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Also found in the Mekong basin (Ref. 43281). Also Ref. 5297, 36654. 
Cynoglossidae Cynoglossus trigrammus Günther, 1862 Fr native   30.57 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Cyprinidae Cyprinus carpio Linnaeus, 1758 Fr introduced  Cá Chép (Vietnamese)  120 cm TL male/unsexed  Found in Ba Be Lake (Ref. 46453). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Cyprinidae Cyprinus dai (Nguyen & Doan, 1969) Fr native    Found in northern Vietnam (Ref. 44416).  No picture yet.
Cyprinidae Cyprinus exophthalmus Mai, 1978 Fr native    Known from northern Vietnam (Ref. 44416).  No picture yet.
Cyprinidae Cyprinus hieni Nguyen & Ho, 2003 Fr native    Found in Thuong Hoa Commune, Cu Nhang dam in Minh Hoa District, Quang Binh (Ref. 94476).  No picture yet.
Cyprinidae Cyprinus hyperdorsalis Nguyen, 1991 Fr native    Known from northern Vietnam (Ref. 44416). Type locality, Da R., North Vietnam (Ref. 46206). 
Cyprinidae Cyprinus melanes (Mai, 1978) Fr native    Known from the Huong River in Hué, Thua Thien Hue Province and mouth of Kien Giang River in Quang Binh Province (Ref. 94476).  No picture yet.
Cyprinidae Cyprinus multitaeniatus Pellegrin & Chevey, 1936 Fr, Thr native  Cá Lợ than thấp (Vietnamese)  42.00 cm TL male/unsexed  Found in Ba Be Lake (Ref. 46453). Present in Da River (Ref. 90167, 89724). Also Ref. 44416. Status of threat: Endangered (Ref. 46452). 
Cyprinidae Cyprinus quidatensis Nguyen, Le, Le & Nguyen, 1999 Fr native      No picture yet.
Cyprinidae Cyprinus rubrofuscus Lacepède, 1803 Fr native   28.00 cm SL male/unsexed  Known from northern Vietnam, but its status needs further confirmation (Ref. 44416). Has been commonly identified as the common carp, Cyprinus carpio, a species native to eastern Europe and central Asia (Ref. 44416). Also Ref. 43281. 
Danionidae Danio albolineatus (Blyth, 1860) Fr native   9.58 cm TL male/unsexed  Know from the Mekong basin (Ref. 43281). 
Danionidae Danio muongthanhensis Nguyen, 2001 Fr native    Type locality, Suôi Muòng Thanh, Diên Biên Co., Lai Châu Prov. (Ref. 56787).  No picture yet.
Danionidae Danio quangbinhensis (Nguyen, Le & Nguyen, 1999) Fr native   8.50 cm SL male/unsexed  Type locality, Phong Nha, Kebang, Quang Bình Prov. (Ref. 46206).  No picture yet.
Danionidae Danio trangi Ngô, 2003 Fr native    Found in limestone mountain area of Phong Nha, Ke Bang. Type locality, Tro Muong, Viet Nam (Ref. 81932).  No picture yet.
Lobotidae Datnioides microlepis Bleeker, 1854 Fr, Br, M native  Cá huòng (Vietnamese) scarce (very unlikely) 55.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625), Gulf of Tonkin, central and southern Vietnam (Ref. 12846). 
Lobotidae Datnioides polota (Hamilton, 1822) Fr, Br, M, Thr native  Cá huòng (Vietnamese) occasional (usually not seen) 30.00 cm SL male/unsexed  Known from Saigon River (Ref. 10425) and Mekong delta (Ref. 36625). Also from the Gulf of Tonkin, central and southern Vietnam (Ref. 12846). Status of threat: Rare (Ref. 46452). 
Lobotidae Datnioides pulcher (Kottelat, 1998) Fr native   40.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732, 43281). 
Lobotidae Datnioides undecimradiatus (Roberts & Kottelat, 1994) Fr native   40.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 43281. 
Cyprinidae Decorus lemassoni (Pellegrin & Chevey, 1936) Fr, Thr native  Cá Rấm xanh (Vietnamese)  30.00 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Known from the Red River basin. Type locality, Tonkin, n. Vietnam (Ref. 46206). Present in Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452).  No picture yet.
Cyprinidae Decorus xanthogenys (Pellegrin & Chevey, 1936) Fr native    Known from northern Vietnam (Ref. 44416). Type locality: Than Son, small affluent of the Claire river, Tonkin (Ref. 33021).  No picture yet.
Zenarchopteridae Dermogenys siamensis Fowler, 1934 Fr native   4.00 cm SL male/unsexed ;6.00 cm SL female  Occurs in the Mekong basin (Ref. 43281). 
Cyprinidae Desmopuntius pentazona (Boulenger, 1894) Fr native   8.80 cm TL male/unsexed   
Danionidae Devario kysonensis (Nguyen, Nguyen & Mua, 2010) Fr native   15.00 cm TL male/unsexed  Known from the Spring Nam Khien, Nam Can commune, Ky Son district, Nghe An province belongs to Lam River system (Ref. 91060).  No picture yet.
Tetraodontidae Dichotomyctere fluviatilis (Hamilton, 1822) Fr native  Cá nóc (Vietnamese)  17.00 cm TL male/unsexed  Museum: Nam Phan (Cochin China), region around Saigon and the Mekong delta, CAS 202438 (Ref. 5515). 
Tetraodontidae Dichotomyctere nigroviridis (Marion de Procé, 1822) Fr native   17.00 cm TL male/unsexed   
Balitoridae Dienbienia namnuaensis Nguyen & Nguyen, 2002 Fr native    Type locality, Nam Nua R., Noong Luong Village, Dienbien dist., Lai Chau Prov. (Ref. 46206).  No picture yet.
Cyprinidae Discogobio caobangi Nguyen, 2001 Fr native    Type locality, Sông Bàng, Cao Bàng (Ref. 56787).  No picture yet.
Cyprinidae Discogobio dienbieni Nguyen, 2001 Fr native    Type locality, Sông Nâm Rôm, Diên Biên Phu, Lai Châu (Ref. 56787).  No picture yet.
Cyprinidae Discogobio microstoma (Mai, 1978) Fr native    Known from northern Vietnam (Ref. 44416). Type locality, fast-running creeks and Na-Ri R., n. Vietnam (Ref. 46206).  No picture yet.
Cyprinidae Discogobio pacboensis Nguyen, 2001 Fr native    Type locality, Suôi Lênin, Pác Bó (Cao Bàng) (Ref. 56787).  No picture yet.
Syngnathidae Doryichthys boaja (Bleeker, 1850) Fr, Br, M native  Cá ngua xuong (Vietnamese) scarce (very unlikely) 41.00 cm SL male/unsexed  Occurs in Central Vietnam (Ref. 9706). Occurrence in saltwater needs confirmation. Found in Mekong delta (Ref. 36625). Also Ref. 5316, 36654, 43281. 
Nemacheilidae Draconectes narinosus Kottelat, 2012 Fr native    Recorded from a cave in Van Gio island in Halong Bay (Ref. 92111).  No picture yet.
Eleotridae Eleotris balia Jordan & Seale, 1905 Fr, Br native    Found in Mekong delta (Ref. 36625).  No picture yet.
Eleotridae Eleotris fusca (Forster, 1801) Fr, Br native  Cá Bống đen (Vietnamese), Cá Bống nâu (Vietnamese), Dusky sleeper (English)  26.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Occurs in the Mekong delta (Ref. 12693). Identity of all records from Vietnam needs checking (Ref. 44416). 
Eleotridae Eleotris melanosoma Bleeker, 1853 Fr, Br, M native  Cá Bống đen (Vietnamese)  26.00 cm SL male/unsexed  Known from Nha Trang (Ref. 58534) and northern Vietnam; identity of all records from Vietnam needs checking (Ref. 44416). Also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). Present in Da River (Ref. 90167, 89724). 
Eleotridae Eleotris oxycephala Temminck & Schlegel, 1845 Fr native  Cá bong trúng (Vietnamese), Cá Bống trứng (Vietnamese)  19.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Known from northern Vietnam; identity of all records from Vietnam needs checking (Ref. 44416). 
Xenocyprididae Elopichthys bambusa (Richardson, 1845) Fr native  Cá Măng (Vietnamese)  200 cm TL male/unsexed  Known from Hanoi, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Identification needs further clarification (Ref. 44416). 
Gastromyzontidae Erromyzon compactus Kottelat, 2004 Fr native   3.08 cm SL male/unsexed  Known from Ba Che drainage, Quang Ninh Province of eastern Vietnam, about 70 km northeast of Haiphong. Only one specimen was collected despite substantial sampling efforts (Ref. 54043).  No picture yet.
Danionidae Esomus longimanus (Lunel, 1881) Fr native  Cá lòng tong bay (Vietnamese)  8.00 cm SL male/unsexed  Also Ref. 36654. 
Danionidae Esomus malayensis Ahl, 1923 Fr native   8.00 cm TL male/unsexed    No picture yet.
Danionidae Esomus metallicus Ahl, 1923 Fr native   7.50 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 36654, 43281. 
Sisoridae Euchiloglanis dorsoarcus Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Sisoridae Euchiloglanis phongthoensis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Gobiidae Eugnathogobius illotus (Larson, 1999) Fr native    Observed during a 1998 survey in Quang Ninh Province, northern Viet Nam (Ref. 44416). 
Gobiidae Eugnathogobius microps Smith, 1931 Fr native   2.65 cm SL male/unsexed  Three specimens were collected from near the mouth of Tien River, Mekong drainage, in southern Vietnam (Ref. 80545).. 
Dasyatidae Fluvitrygon oxyrhynchus (Sauvage, 1878) Fr native   36.00 cm WD male/unsexed  Type locality, Saigon. 
Cyprinidae Folifer brevifilis (Peters, 1881) Fr, Thr native   40.50 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452). 
Poeciliidae Gambusia affinis (Baird & Girard, 1853) Fr introduced   5.10 cm TL male/unsexed ;7.00 cm TL female  Present in Da River (Ref. 90167, 89724). 
Cyprinidae Garra apogon (Norman, 1925) Fr native    Known from northern Vietnam (Ref. 44416). Type locality: Ngoi-Tio, Col des Nuages, Tonkin, Vietnam, elev. 4500-6500 ft. (Ref. 33021). Also Ref. 27732.  No picture yet.
Cyprinidae Garra bourreti (Pellegrin, 1928) Fr native    Known from Hong River basin (Ref. 44416).  No picture yet.
Cyprinidae Garra centrala Nguyen, Vu & Nguyen, 2015 Fr native   13.50 cm SL male/unsexed  Type locality of Garra centrala, Quang Tri prov., Dakrong district, Dakrong River (Ref. 128949).  No picture yet.
Cyprinidae Garra cyclostomata Mai, 1978 Fr native   15.00 cm SL male/unsexed  Occurs in northern Viet Nam (Ref. 43281). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Garra gracilis (Pellegrin & Chevey, 1936) Fr native    Known from northern Vietnam (Ref. 44416). Type locality, Vicinity of Hagiang, Son Pak Xun, affluent of Claire R., Tonkin (Ref. 46206).  No picture yet.
Cyprinidae Garra imbarbatus (Nguyen, 2001) Fr native    Type locality, Tam Duòng, Phong Thô, Lai Châu (Ref. 56787).  No picture yet.
Cyprinidae Garra imberbis (Vinciguerra, 1890) Fr native   9.00 cm TL male/unsexed    No picture yet.
Cyprinidae Garra nasuta (McClelland, 1838) Fr native   20.00 cm NG male/unsexed  Also Ref. 41236. 
Cyprinidae Garra orientalis Nichols, 1925 Fr native  Cá Bâu (Vietnamese)  20.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Cyprinidae Garra poilanei Petit & Tchang, 1933 Fr native      No picture yet.
Gobiidae Glossogobius aureus Akihito & Meguro, 1975 Fr native   25.00 cm SL male/unsexed  Found in the Mekong basin (Ref. 43281). 
Gobiidae Glossogobius giuris (Hamilton, 1822) Fr, Br, M native  Cá Bống cát (Vietnamese), Tank goby (English), Cá bong cat (Vietnamese)  50.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Known from northern Vietnam; identity of all records from Vietnam needs checking (Ref. 44416). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 58534. 
Sisoridae Glyptothorax filicatus Ng & Freyhof, 2008 Fr native   9.19 cm SL male/unsexed  Known from Se Sap River drainage, a tributary of the Mekong River (Ref. 79574). 
Sisoridae Glyptothorax hainanensis (Nichols & Pope, 1927) Fr native    Present in Da River (Ref. 90167, 89724).  No picture yet.
Sisoridae Glyptothorax honghensis Li, 1984 Fr native   8.80 cm SL male/unsexed  Known from Hong River basin, northern Vietnam (Ref. 44416).  No picture yet.
Sisoridae Glyptothorax interspinalum (Mai, 1978) Fr native   10.55 cm SL male/unsexed  Known from the Red River basin (Ref. 43281). Present in Da River (Ref. 90167, 89724). 
Sisoridae Glyptothorax laosensis Fowler, 1934 Fr native   10.80 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Sisoridae Glyptothorax quadriocellatus (Mai, 1978) Fr native   11.50 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Sisoridae Glyptothorax strabonis Ng & Freyhof, 2008 Fr native   9.55 cm SL male/unsexed  Known from Giang River (Song Giang) drainage in central Vietnam (Ref. 79574).  No picture yet.
Gobionidae Gobiobotia kolleri Bănărescu & Nalbant, 1966 Fr native   12.50 cm SL male/unsexed  Tentatively recorded based on a specimen observed in 1991 in the Lo river basin (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Gobiidae Gobiopterus chuno (Hamilton, 1822) Fr native   3.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). 
Gyrinocheilidae Gyrinocheilus aymonieri (Tirant, 1883) Fr, Thr native  Cá may (Vietnamese)  28.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Status of threat: Rare (Ref. 46452). 
Xenocyprididae Hainania serrata Koller, 1927 Fr native   13.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Hampala macrolepidota Kuhl & Van Hasselt, 1823 Fr native  Cá ngua (Vietnamese), Cá Ngựa nam (Vietnamese), Cá Ngựa sông (Vietnamese), Cá ngu'a (Vietnamese)  70.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Refs. 2682, 36625, 36654, 43281, 45536. 
Pangasiidae Helicophagus leptorhynchus Ng & Kottelat, 2000 Fr native   47.20 cm SL male/unsexed  Known from the Mekong basin. Also Ref. 43281. 
Pangasiidae Helicophagus waandersii Bleeker, 1858 Fr native  Cá tra chuot (Vietnamese)  70.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 37770, 49196. 
Ariidae Hemiarius stormii (Bleeker, 1858) Fr native   50.00 cm TL male/unsexed  Known from the Mekong basin (Ref. 43281). 
Bagridae Hemibagrus camthuyensis Nguyen, 2005 Fr native    Found in Thanh Hoá (Ref. 84796).  No picture yet.
Bagridae Hemibagrus centralus Mai, 1978 Fr native  Cá Lặng miền trung (Vietnamese)   Known from northern Viet Nam (Ref. 44416). Present in Dakrong River (Ref. 89722). Also Ref. 40798.  No picture yet.
Bagridae Hemibagrus chiemhoaensis Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Bagridae Hemibagrus dongbacensis Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Bagridae Hemibagrus filamentus (Fang & Chaux, 1949) Fr native   50.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Bagridae Hemibagrus guttatus (Lacepède, 1803) Fr, Thr native  Cá Lăng chấm (Vietnamese)  73.10 cm SL male/unsexed  Found in Red River basin (Ref. 43281). Present in Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452). 
Bagridae Hemibagrus hongus Mai, 1978 Fr native    Known from northern Vietnam (Ref. 44416). Type locality, Hông R. and Lam R. (Ref. 46206).  No picture yet.
Bagridae Hemibagrus nemurus (Valenciennes, 1840) Fr, Br, Fi native  Cá Lang (Vietnamese), Cá Lăng (Vietnamese)  65.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 2682, 36654. 
Bagridae Hemibagrus planiceps (Valenciennes, 1840) Fr native  Cá chot (Vietnamese)  33.50 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Bagridae Hemibagrus pluriradiatus (Vaillant, 1892) Fr native   21.60 cm SL male/unsexed  Known from Tonkin, northern Vietnam (Ref. 6868). Found in Red River basin (Ref. 43281). Present in Da River (Ref. 90167, 89724). 
Bagridae Hemibagrus songdaensis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Bagridae Hemibagrus taybacensis Nguyen, 2005 Fr native    Found in Lai Chau, Hoà Bình and Lào Cai (Ref. 84796).  No picture yet.
Bagridae Hemibagrus vietnamicus Mai, 1978 Fr native    Known from northern Viet Nam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Type locality, Mountain streams in n. Vietnam (Ref. 46206). Also Ref. 40798. 
Bagridae Hemibagrus wyckii (Bleeker, 1858) Fr native  Cá lang (Vietnamese)  90.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Bagridae Hemibagrus wyckioides (Fang & Chaux, 1949) Fr native   130 cm TL male/unsexed  Occurs in Phung Ding Province. 
Gobionidae Hemibarbus labeo (Pallas, 1776) Fr native   67.00 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Gobionidae Hemibarbus lehoai Nguyen, 2001 Fr native    Type locality, Suôi Mân Lay, xã Muòng Tùng, Huyên Muòng Lay, Tinh Lai Châu (Ref. 56787).  No picture yet.
Gobionidae Hemibarbus macracanthus Lu, Luo & Chen, 1977 Fr native   30.00 cm TL male/unsexed   
Gobionidae Hemibarbus maculatus Bleeker, 1871 Fr native   47.00 cm TL male/unsexed ;34.30 cm TL female  Present in Da River (Ref. 90167, 89724). 
Gobionidae Hemibarbus songloensis Nguyen, 2001 Fr native    Type locality, Sông Lô, Hà Giang (Ref. 56787).  No picture yet.
Gobionidae Hemibarbus thacmoensis Nguyen, 2001 Fr native    Type locality, Thac Mo, Na Hang, Tuyên Quang (Ref. 56787).  No picture yet.
Xenocyprididae Hemiculter elongatus Nguyen & Ngo, 2001 Fr native    Type locality, Sông Ky Cùng, Lang Son (Ref. 56787).  No picture yet.
Xenocyprididae Hemiculter krempfi Pellegrin & Chevey, 1938 Fr native    Known from Annam.  No picture yet.
Xenocyprididae Hemiculter leucisculus (Basilewsky, 1855) Fr native  Cá Mựơng (Vietnamese)  29.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Distributed in Annam (Ref. 26580). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Xenocyprididae Hemiculter songhongensis Nguyen & Nguyen, 2001 Fr native    Type locality, Sông Hông, Hà Nôi (Ref. 56787).  No picture yet.
Balitoridae Hemimyzon ecdyonuroides Freyhof & Herder, 2002 Fr native   4.21 cm SL male/unsexed  Type locality, River Pako about 50 km north of Kontum, Kontum Prov. 
Balitoridae Hemimyzon papilio Kottelat, 1998 Fr native   5.92 cm SL male/unsexed  Known from the Mekong and Dong Nai basins. Collected from Lam Dong Prov., River Dai Tan at village Lam Ha south of Da Lat and Kontum Prov., River Pako (Ref. 42935). Also Ref. 43281. 
Balitoridae Hemimyzon songamensis Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Cyprinidae Henicorhynchus entmema (Fowler, 1934) Fr native   15.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 123185). 
Cyprinidae Henicorhynchus siamensis (Sauvage, 1881) Fr native   20.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). From May to July, at the start of the rainy season, it migrates downstream from the Khone Falls to the Mekong Delta. Here, the fish moves out of the Mekong into canals and flooded areas in August-September. When water recedes during November-December, fish migrate to the Mekong again (Ref. 37770). Occurrence in Annam needs further confirmation (Ref. 26580). Also Ref. 36654. 
Balitoridae Homalopteroides indochinensis (Silas, 1953) Fr native   4.00 cm TL male/unsexed  Occurs in Annam (Ref. 26580). 
Xenocyprididae Hypophthalmichthys harmandi Sauvage, 1884 Fr native  Cá Mè trắng Việt Nam (Vietnamese), Mè trắng (Vietnamese)  54.50 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Type locality, Hanoi (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Xenocyprididae Hypophthalmichthys molitrix (Valenciennes, 1844) Fr native   120 cm TL male/unsexed  Known from Hanoi (Ref. 120939). Reported in fisheries literature and reports, but its unclear whether this species really occurs or is cultivated in Vietnam (Ref. 44416). Since this is known from Pearl River basin in China, its presence (naturally, not cultivated stocks) might be expected in that basin in Vietnam (Ref. 44416). 
Xenocyprididae Hypophthalmichthys nobilis (Richardson, 1845) Fr introduced  Cá Mè hoa (Vietnamese)  146 cm SL male/unsexed  Has established in aquaculture through assisted/artificial reproduction. Has not established in the wild (Ref. 1739). Recently, FAO reports that a natural population of bighead carp has been recorded from the Red River (Ref. 120904). 
Hemiramphidae Hyporhamphus limbatus (Valenciennes, 1847) Fr, Br, M native  Cá Kìm bên (Vietnamese), Congaturi halfbeak (English) common (usually seen) 35.00 cm TL male/unsexed  Known from the Gulf of Tonkin (Ref. 9706) and northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 9843. 
Loricariidae Hypostomus plecostomus (Linnaeus, 1758) Fr introduced  common (usually seen) 24.98 cm SL male/unsexed  Fishermen are catching significant numbers of this fish. Dr. Amararatne Yakupitiyage (pers. comm) July 22, 2004. 
Cyprinidae Hypsibarbus annamensis (Pellegrin & Chevey, 1936) Fr native    Found only in Hang Giang basin (Ref. 44416) from Annam (Ref. 26580). Type locality, Hang Giang, China Sea slope, Annam (Ref. 46206).  No picture yet.
Cyprinidae Hypsibarbus macrosquamatus (Mai, 1978) Fr native    Known from northern Vietnam (Ref. 44416). Identification needs further confirmation (Ref. 44416).  No picture yet.
Cyprinidae Hypsibarbus pierrei (Sauvage, 1880) Fr native   36.90 cm TL male/unsexed  Known from the Dong Ngai River (Saigon River) and Mekong River (Ref. 43281). Also occurs in Annam (Ref. 26580). Also Ref. 12693, 30857, 36654. 
Cyprinidae Hypsibarbus suvattii Rainboth, 1996 Fr native   35.00 cm SL male/unsexed  Known from Annam (Ref. 26580) and Dong Ngai river (Ref. 12693). 
Cyprinidae Hypsibarbus vernayi (Norman, 1925) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong basin. Also known from Annam (Ref. 26580). Also Ref. 43281. 
Cyprinidae Hypsibarbus wetmorei (Smith, 1931) Fr native  Cá mè vinh (Vietnamese)  46.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Pristigasteridae Ilisha megaloptera (Swainson, 1838) Fr, Br, M native  Cá be tráng (Vietnamese), Cá Bẹ vây lớn (Vietnamese) scarce (very unlikely) 36.50 cm SL male/unsexed  Known from Southern Vietnam (Ref. 9706). Found in Mekong delta (Ref. 36625). Also Ref. 188. 
Cyprinidae Incisilabeo behri (Fowler, 1937) Fr native   60.00 cm TL male/unsexed  Recorded from the Mekong delta and reported to be non-migratory. This is in contrast to other reports that this species undergoes migration. Thus, occurrence in the Mekong delta needs confirmation. 
Sciaenidae Johnius borneensis (Bleeker, 1851) Fr, Br, M native  Cá Đù (Vietnamese)  34.80 cm TL male/unsexed   
Siluridae Kryptopterus bicirrhis (Valenciennes, 1840) Fr native   15.00 cm SL male/unsexed   
Siluridae Kryptopterus geminus Ng, 2003 Fr, Br native  Cá trèn mo (Vietnamese)  17.06 cm SL male/unsexed  Known from the Mekong River drainage (Ref. 50583); Mekong delta (Ref. 36625), Also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Siluridae Kryptopterus paraschilbeides Ng, 2003 Fr native   8.31 cm SL male/unsexed    No picture yet.
Cyprinidae Labeo catla (Hamilton, 1822) Fr introduced   182 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Cyprinidae Labeo chrysophekadion (Bleeker, 1849) Fr native  Cá ét moi (Vietnamese), Cá Ét mọi (Vietnamese)  90.00 cm TL male/unsexed  Known from the Mekong basin (Ref. 27732). Juveniles have been recorded in small numbers in An Giang province in June-July (Ref. 37770). Reported to spawn in flooded ricefields and grasslands (Ref. 37770). Museum: Pnom-Penh, intersection of the 4 arms of the river, Mekong side, 7 (Ref. 26092). Also Ref. 36625, 36654, 43281. 
Cyprinidae Labeo indramontri Smith, 1945 Fr native  Cá linh chu (Vietnamese)   Found in Mekong delta (Ref. 36625).  No picture yet.
Cyprinidae Labeo pierrei (Sauvage, 1880) Fr native   80.00 cm SL male/unsexed  Also Ref. 43281. 
Cyprinidae Labeo rohita (Hamilton, 1822) Fr introduced  Cá Trôi (Vietnamese), Cá Trôi Ân Độ, Rôhu (Vietnamese), Cá Trôi Ân Độ (Vietnamese)  200 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). Also Ref. 13686. 
Cyprinidae Labiobarbus leptocheilus (Valenciennes, 1842) Fr native  Cá linh ria (Vietnamese)  30.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 7424). Also Ref. 27732, 36625, 43281. 
Cyprinidae Labiobarbus siamensis (Sauvage, 1881) Fr native  Cá linh ria (Vietnamese)  22.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Ailiidae Laides longibarbis (Fowler, 1934) Fr native   14.20 cm SL male/unsexed  Museum: S side of Can Tho Island 3 km SE of Can Tho, Phong Dinh Province, UMMZ 224951 (4.02 cm SL) (Ref. 39209). Also Ref. 43281. 
Lateolabracidae Lateolabrax japonicus (Cuvier, 1828) Fr, Br, M native  Cá Vược Nhật (Vietnamese), Japanese seaperch (English) common (usually seen) 102 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416) and Gulf of Tonkin (Ref. 12846); also from Quang Ninh-Cat Ba (Ref. 58534). Also Ref. 2682. 
Latidae Lates calcarifer (Bloch, 1790) Fr, Br, M, Lf native  Cá Chẽm (Vietnamese), Cá Vược (Vietnamese), Barramundi (English), Giant seaperch (English), Ca vuoc (Vietnamese) common (usually seen) 200 cm TL male/unsexed  Found in Mekong delta (Ref. 36625), Gulf of Tonkin, central and southern Vietnam (Ref. 12846); also from Quang Ninh-Cat Ba (Ref. 58534). Also Ref. 46893. 
Danionidae Laubuka caeruleostigmata Smith, 1931 Fr native   7.00 cm SL male/unsexed  Known from the Mekong basin. 
Danionidae Laubuka laubuca (Hamilton, 1822) Fr native   10.54 cm TL male/unsexed  Known from the Mekong basin. Also found in Annam (Ref. 26580). Also Ref. 36654. 
Bagridae Leiocassis brevirostris Nguyen, 2005 Fr native      No picture yet.
Bagridae Leiocassis yeni Nguyen & Nguyen, 2005 Fr native      No picture yet.
Tetraodontidae Leiodon cutcutia (Hamilton, 1822) Fr native   15.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Cobitidae Lepidocephalichthys hasselti (Valenciennes, 1846) Fr native   6.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). Also Ref. 7050. 
Cobitidae Lepidocephalichthys kranos Havird & Page, 2010 Fr native   3.31 cm SL male/unsexed ;4.36 cm SL female    No picture yet.
Cobitidae Lepidocephalichthys zeppelini Havird & Tangjitjaroen, 2010 Fr native   2.60 cm SL male/unsexed  Known from the Mekong drainage (Ref. 84769).  No picture yet.
Leptobarbidae Leptobarbus hoevenii (Bleeker, 1851) Fr native  Cá chài (Vietnamese)  100.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also known from Annam (Ref. 26580). Also Ref. 2682, 36654, 43281. 
Gastromyzontidae Liniparhomaloptera disparis (Lin, 1934) Fr native   8.00 cm TL male/unsexed  Found in Na Ri, northern Vietnam (Ref. 44416). Species identification needs further verification (Ref. 44416). 
Gastromyzontidae Liniparhomaloptera monoloba (Mai, 1978) Fr native    Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Lobocheilos fowleri (Pellegrin & Chevey, 1936) Fr native    Type locality: Ea Hléo, affluent of the Srépok R., Annam, Vietnam.  No picture yet.
Cyprinidae Lobocheilos rhabdoura (Fowler, 1934) Fr native   22.00 cm SL male/unsexed   
Xenocyprididae Luciobrama macrocephalus (Lacepède, 1803) Fr native   48.00 cm TL male/unsexed  Known from Hanoi, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Luciocyprinus langsoni Vaillant, 1904 Fr, Thr native   79.00 cm SL male/unsexed  Known from Song-Ki-Kon at Lang Son. Also Ref. 37832, 44416. Status of threat: Vulnerable (Ref. 46452).  No picture yet.
Danionidae Luciosoma bleekeri Steindachner, 1878 Fr native  Cá lòng tong muong (Vietnamese)  25.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 43281. 
Danionidae Luciosoma setigerum (Valenciennes, 1842) Fr native   26.00 cm SL male/unsexed  Occurs in the Mekong River. 
Engraulidae Lycothrissa crocodilus (Bleeker, 1850) Fr, Br native  Cá Lẹp sâu (Vietnamese), Cà top (Vietnamese), Cá Tớp xuôi (Vietnamese)  30.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 7050, 36654. 
Xenocyprididae Macrochirichthys macrochirus (Valenciennes, 1844) Fr native  Cá rua (Vietnamese), Cá ru'a (Vietnamese)  100.00 cm TL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 7050, 36654, 43281, 45563. 
Mastacembelidae Macrognathus aculeatus (Bloch, 1786) Fr native  Cá Chạch lá tre (Vietnamese), Cá chach song (Vietnamese)  38.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Present in Da River (Ref. 90167, 89724). 
Mastacembelidae Macrognathus maculatus (Cuvier, 1832) Fr native   28.00 cm TL male/unsexed   
Mastacembelidae Macrognathus semiocellatus Roberts, 1986 Fr native   19.20 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 39392. 
Mastacembelidae Macrognathus siamensis (Günther, 1861) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 36654, 83418. 
Mastacembelidae Macrognathus taeniagaster (Fowler, 1935) Fr native  Cá chach song (Vietnamese)  22.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Osphronemidae Macropodus baviensis Nguyen & Nguyen, 2005 Fr native      No picture yet.
Osphronemidae Macropodus erythropterus Freyhof & Herder, 2002 Fr native   6.51 cm SL male/unsexed  Collected in the catchment of the coastal rivers Quang Tri, Cam Lo and Giang (in small hill streams), all entering the sea at the Vietnamese city of Dong Ha and Dong Hoi. Type locality, stream at Quyêt Tiên, Quang Binh Prov. (Ref. 42924). 
Osphronemidae Macropodus lineatus Nguyen, Ngo & Nguyen, 2005 Fr native    Found in Quang Binh (Ref. 84797).  No picture yet.
Osphronemidae Macropodus oligolepis Nguyen, Ngo & Nguyen, 2005 Fr native    Found in Quang Binh (Ref. 84797).  No picture yet.
Osphronemidae Macropodus opercularis (Linnaeus, 1758) Fr native   6.70 cm SL male/unsexed  Found in most coastal basins from Vinh to Thuy Hoa, except from the basins of the rivers Huong and Quang tri, which enter the sea at the city of Hue and Dong Ha, respectively. Also recorded in headwaters of the Dong Nai River, which enter the sea at Saigon, in headwaters of the Sesan River, a tributary of the Sekong River, itself a tributary of the Mekong River. Apparently, the distribution in rivers Ba, Dong Nai, and Sesan is partly the result of introductions; recorded only in mountainous regions (Ref. 42924). Present in Da River (Ref. 90167, 89724). Also Ref. 1739, 43281. 
Osphronemidae Macropodus phongnhaensis Ngô, Nguyen & Nguyen, 2005 Fr native    Found in Quang Binh (Ref. 84797).  No picture yet.
Osphronemidae Macropodus spechti Schreitmüller, 1936 Fr native  Black paradise fish (English)  5.76 cm SL male/unsexed  Found in the catchment of the rivers Huong and Thu Bon which enter the sea at the cities of Hue and Hoi An, respecively, and in small coastal basins in between (Ref. 42924). 
Mastacembelidae Mastacembelus armatus (Lacepède, 1800) Fr native  Cá Chạch bông (Vietnamese), Cá Chạch sộng 1 (Vietnamese), Cá chachlau (Vietnamese)  90.00 cm TL male/unsexed  Found in Lai Chau and Vu Quang (Ref. 44416). Occurs in the Mekong basin (Ref. 27732). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Spawns in ricefields (Ref. 37770). Also Ref. 36625, 43281, 43640. 
Mastacembelidae Mastacembelus dienbienensis Nguyen & Nguyen, 2005 Fr native    Found in Dien Bien (Ref. 84797).  No picture yet.
Mastacembelidae Mastacembelus erythrotaenia Bleeker, 1850 Fr native  Cá chachlua (Vietnamese)  100.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Mastacembelidae Mastacembelus thacbaensis Nguyen & Nguyen, 2005 Fr native    Found in Yen Bai (Ref. 84797).  No picture yet.
Xenocyprididae Megalobrama mantschuricus (Basilewsky, 1855) Fr native   37.70 cm male/unsexed  Present in Da River (Ref. 90167, 89724).  No picture yet.
Xenocyprididae Megalobrama terminalis (Richardson, 1846) Fr, Thr native  Cá Vền (Vietnamese)  60.00 cm TL male/unsexed  Found in Ba Be Lake (Ref. 46453). Present in Da River (Ref. 90167, 89724). Also Ref. 44416. Status of Threat: Vulnerable (Ref. 46452). 
Megalopidae Megalops cyprinoides (Broussonet, 1782) Fr, Br, M, Thr native  Cá Cháo lớn (Vietnamese) occasional (usually not seen) 150 cm TL male/unsexed  Known from southern Vietnam (Ref. 9706). Status of threat: Rare (Ref. 46452). 
Cyprinidae Mekongina bibarba Nguyen, 2001 Fr native    Type locality, Sông Sesan, from hô Yaly, tinh Kon Tum, Tây Nguyen (Ref. 56787).  No picture yet.
Cyprinidae Mekongina erythrospila Fowler, 1937 Fr native   45.00 cm SL male/unsexed  Occurs in the Mekong basin. 
Xenocyprididae Metzia alba (Nguyen, 1991) Fr native      No picture yet.
Xenocyprididae Metzia formosae (Oshima, 1920) Fr native   7.30 cm SL male/unsexed  Observed during the 1999 survey of the Lo River basin and the 1998 in Quang Ninh Prov. (Ref. 44416). 
Xenocyprididae Metzia hautus (Nguyen, 1991) Fr native    Known from Nghia Dan in Nghe Tinh Province (Ref. 44416).  No picture yet.
Xenocyprididae Metzia lineata (Pellegrin, 1907) Fr native   10.00 cm SL male/unsexed  Known from Hanoi in northern Vietnam (Ref. 44416). Occurs in the Red River basin (Ref. 43281). Present in Da River (Ref. 90167, 89724). 
Cobitidae Microcobitis misgurnoides (Rendahl, 1944) Fr native   4.10 cm SL male/unsexed  Known from the coastal streams of Annam. Also Ref. 26580.  No picture yet.
Odontobutidae Micropercops cinctus (Dabry de Thiersant, 1872) Fr native   8.00 cm TL male/unsexed  Found in north Viet Nam (Ref. 26334). 
Odontobutidae Micropercops hotayensis Mai, 1978 Fr native    Found in Ho Tay, Hanoi (Ref. 44416).  No picture yet.
Gobionidae Microphysogobio kachekensis (Oshima, 1926) Fr native  Cá Đục đanh chẫm (Vietnamese)  6.69 cm SL male/unsexed  Present in Dakrong River (Ref. 89722).  No picture yet.
Gobionidae Microphysogobio labeoides (Nichols & Pope, 1927) Fr native   9.20 cm SL male/unsexed  Occurs in northern Viet Nam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 43281. 
Gobionidae Microphysogobio vietnamica Mai, 1978 Fr native    Occurs in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Gobionidae Microphysogobio yunnanensis (Yao & Yang, 1977) Fr native  Cá Đục đanh chẫm mõm ngẫn (Vietnamese)  9.90 cm SL male/unsexed  Expected to occur in Hong River basin in northern Vietnam (Ref. 44416). Present in Dakrong River (Ref. 89722).  No picture yet.
Centrarchidae Micropterus dolomieu Lacepède, 1802 Fr introduced   69.00 cm TL male/unsexed   
Cobitidae Misgurnus anguillicaudatus (Cantor, 1842) Fr native  Cá Chạch bùn (Vietnamese), Chạch bùn (Vietnamese)  28.00 cm SL male/unsexed  Known from the coastal streams of Annam (Ref. 12041). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 2682, 26580, 27732, 43281. 
Cobitidae Misgurnus multimaculatus Rendahl, 1944 Fr native    Found in Annam (Ref. 94476).  No picture yet.
Cobitidae Misgurnus tonkinensis Rendahl, 1937 Fr native    Found in Hanoi, northern Vietnam. Occurs within about 20 m from the sea shore in Nghe An Province (Ref. 44416).  No picture yet.
Synbranchidae Monopterus albus (Zuiew, 1793) Fr, Br native  Luon (Vietnamese), Lươn (Vietnamese), Lươn đồng (Vietnamese), Con lu'o'n (Vietnamese)  100.00 cm SL male/unsexed  Known from Hanoi and Vu Quang in northern Vietnam (Ref. 44416). Found in the Mekong basin in Yunnan (Ref. 27732). Present in Da River (Ref. 90167, 89724). Also Ref. 27732, 43281. 
Synbranchidae Monopterus bicolor Nguyen & Nguyen, 2005 Fr native      No picture yet.
Synbranchidae Monopterus dienbienensis Nguyen & Nguyen, 2005 Fr native    Found in Dien Bien (Ref. 84797).  No picture yet.
Mugilidae Mugil cephalus Linnaeus, 1758 Fr, Br, M native  Bully mullet (English), Cá Đối mục (Vietnamese), Flathead mullet (English) common (usually seen) 100.00 cm SL male/unsexed  Found in the Gulf of Tonkin, Central and Southern Vietnam (Ref. 2682); also from Quang Ninh-Cat Ba and Spratly islands (Ref. 58534). Also Ref. 46893. 
Gobiidae Mugilogobius chulae (Smith, 1932) Fr, Br, M native   4.00 cm TL male/unsexed  Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). Also known from Nha Trang (Ref. 58534). 
Gobiidae Mugilogobius nuicocensis Nguyen & Vo, 2005 Fr native    Found in Thai Nguyen (Ref. 84797).  No picture yet.
Muraenesocidae Muraenesox cinereus (Forsskål, 1775) Fr, Br, M native  Dagger tooth pikeconger (English), Cá Dưa bạc (Vietnamese), Cá Dưa xám (Vietnamese) common (usually seen) 220 cm TL male/unsexed  Known from the Gulf of Tonkin, Central and Southern Vietnam (Ref. 9706); also from Quang Ninh-Cat Ba (Ref. 58534). 
Xenocyprididae Mylopharyngodon piceus (Richardson, 1846) Fr, Thr native  Cá Trắm đen (Vietnamese), Trắm đen (Vietnamese)  180 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452). 
Cyprinidae Mystacoleucus marginatus (Valenciennes, 1842) Fr native  Cá Vảy xước (Vietnamese)  20.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 7050, 36654, 43281. 
Bagridae Mystus bocourti (Bleeker, 1864) Fr native  Cá chot co (Vietnamese)  24.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Bagridae Mystus gulio (Hamilton, 1822) Fr native  Cá chot trang (Vietnamese), Cá Chôt (Vietnamese)  46.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625) and northern Vietnam (Ref. 44416). Also Ref. 2682, 6028. 
Bagridae Mystus multiradiatus Roberts, 1992 Fr native   12.80 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Bagridae Mystus singaringan (Bleeker, 1846) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 27732, 43281. 
Bagridae Mystus velifer Ng, 2012 Fr native   14.48 cm SL male/unsexed  Known from the Mekong River (Ref. 91083).  No picture yet.
Bagridae Mystus wolffii (Bleeker, 1851) Fr native  Cá chot tráng (Vietnamese), Cá Chốt trắng (Vietnamese)  20.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Amblycipitidae Nahangbagrus songamensis Nguyen & Vo, 2005 Fr native    Found in Tuyen Quang (Ref. 84796).  No picture yet.
Nandidae Nandus nandus (Hamilton, 1822) Fr native  Cá huòng ven (Vietnamese), Cá Sặc vện (Vietnamese)  20.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Nandidae Nandus nebulosus (Gray, 1835) Fr native   12.00 cm TL male/unsexed   
Nandidae Nandus oxyrhynchus Ng, Vidthayanon & Ng, 1996 Fr native   6.90 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). 
Nemacheilidae Nemacheilus banar Freyhof & Serov, 2001 Fr native   8.04 cm SL male/unsexed  Recorded from headwaters of the River Ba or Da Rang and from the headwaters of the River Sesan, a tributary of the Sekong, itself a tributary of the Mekong (Ref. 40772).  No picture yet.
Nemacheilidae Nemacheilus cleopatra Freyhof & Serov, 2001 Fr native   7.97 cm SL male/unsexed  Type locality: River Sol near Plao Ganong ca 60 km south of Pleiku, 13°31.82'N, 108°18.63'E, Gia Lai Prov., Vietnam.  No picture yet.
Nemacheilidae Nemacheilus pallidus Kottelat, 1990 Fr native   14.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 43281. 
Nemacheilidae Nemacheilus platiceps Kottelat, 1990 Fr native   6.10 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also found in Annam (Ref. 26580). Also Ref. 12693, 39226. 
Cyprinidae Neobarynotus microlepis (Bleeker, 1851) Fr native   40.00 cm TL male/unsexed   
Odontobutidae Neodontobutis macropectoralis (Mai, 1978) Fr native    Type locality, Northern Vietnam (Ref. 50838).  No picture yet.
Odontobutidae Neodontobutis ngheanensis Nguyen & Nguyen, 2011 Fr native   6.30 cm SL male/unsexed  Known from Khe Khang stream of Lam river basin in Pu Mat national park, Nghe An province (Ref. 91061).  No picture yet.
Odontobutidae Neodontobutis tonkinensis (Mai, 1978) Fr native   4.90 cm SL male/unsexed  Occurs in northern Viet Nam (Ref. 43281, 44416).  No picture yet.
Cyprinidae Neolissochilus benasi (Pellegrin & Chevey, 1936) Fr native   17.40 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Type locality: Laokay Prov. (Ref. 46206).  No picture yet.
Cyprinidae Neolissochilus hexagonolepis (McClelland, 1839) Fr native   120 cm TL male/unsexed   
Cyprinidae Neolissochilus namlenensis (Nguyen & Doan, 1969) Fr native    Type locality, Nam Len, Tuan Giao, Lai Chau Prov. (Ref. 46206).  No picture yet.
Cyprinidae Neolissochilus stracheyi (Day, 1871) Fr native  Cá Dầm (Vietnamese)  60.00 cm SL male/unsexed  Present in Dakrong River (Ref. 89722). 
Salangidae Neosalanx brevirostris (Pellegrin, 1923) Fr, Br, M native   7.00 cm SL male/unsexed  Known from Hanoi, northern Vietnam (Ref. 44416). Also Ref. 12965, 34809.  No picture yet.
Sciaenidae Nibea soldado (Lacepède, 1802) Fr, Br, M native  Cá Uốp lưng xanh (Vietnamese), Cá suu (Vietnamese), Green-backed jewfish (English) common (usually seen) 60.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625), Gulf of Tonkin, central and southern Vietnam (Ref. 12846). Also Ref. 9772. 
Notopteridae Notopterus notopterus (Pallas, 1769) Fr native  Cá thát lát (Vietnamese)  60.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 37770, 43281, 44416. 
Xenocyprididae Ochetobius elongatus (Kner, 1867) Fr native   40.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Odontobutidae Odontobutis potamophilus (Günther, 1861) Fr native   15.20 cm TL male/unsexed  Reported from Hanoi and Vy Quang under obscura.  No picture yet.
Siluridae Ompok hypophthalmus (Bleeker, 1846) Fr native   30.00 cm SL male/unsexed   
Siluridae Ompok siluroides Lacepède, 1803 Fr native  Cá tren bau (Vietnamese), Cá Trèn bầu (Vietnamese)  21.44 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 43281. 
Cyprinidae Onychostoma dongnaiense Hoang, Pham & Tran, 2015 Fr native   1.96 cm SL male/unsexed  Known from the Da Teh catchment of middle Dong Nai drainage in evergreen forest between 140−200 m. Likely to be confined to relatively small stretches of low-elevation forest streams of the middle Dong Nai drainage and thus particularly vulnerable to threats such as siltation and overfishing. Common human activities such as modification of stream morphology, logging, deforestation, agriculture and overfishing in the Da Teh catchment potentially pose threat to its population (Ref. 102622). Status of threat: data deficient following IUCN Red List categories (IUCN 2014, version 11) (Ref. 102622).  No picture yet.
Cyprinidae Onychostoma elongatum (Pellegrin & Chevey, 1934) Fr native   11.50 cm SL male/unsexed  Occurs in northern Vietnam (Ref. 44416) in the Red River basin (Ref. 43281). Type locality: Ngoi-Thia river at Nghia Lo (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Cyprinidae Onychostoma fangi Kottelat, 2000 Fr native   29.50 cm TL male/unsexed  Recorded from Quang Ninh Province, northern Vietnam (Ref. 44416). 
Cyprinidae Onychostoma gerlachi (Peters, 1881) Fr native  Cá Sinh (Vietnamese)  31.64 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Found in Annam (Ref. 26580). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 82789. 
Cyprinidae Onychostoma krongnoense Hoang, Pham & Tran, 2015 Fr, Fi native  Krongno srang (English), Cá srang Krông Nô (Vietnamese)  2.38 cm SL male/unsexed  Known from the Ea Krong No drainage basin, composed of montane mixed pine and evergreen forest between 596-1112m, in Lam Dong Province. Harvested by local people using cast nets during dry season from December to April when river water levels are low. This method of harvesting is unlikely to affect its populations (Ref. 102622).  No picture yet.
Cyprinidae Onychostoma laticeps Günther, 1896 Fr, Thr native  Cá Sỉnh (Vietnamese), Cá Sỉnh gai (Vietnamese)   Found in Ba Be Lake (Ref. 46453). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Status of threat: Vulnerable (Ref. 46452).  No picture yet.
Cyprinidae Onychostoma lepturus (Boulenger, 1900) Fr native  Cá Sỉnh gai (Vietnamese)  23.82 cm SL male/unsexed  Occurs in northern Viet Nam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 43281.  No picture yet.
Cyprinidae Onychostoma ovale Pellegrin & Chevey, 1936 Fr native   34.36 cm SL male/unsexed  Type locality: Phu-Thô (Song Bua, fleuve Rouge), Tonkin, Vietnam (Ref. 33021). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Onychostoma simum (Sauvage & Dabry de Thiersant, 1874) Fr native   41.50 cm SL male/unsexed   
Cyprinidae Onychostoma uniforme (Mai, 1978) Fr native    Reported from Na Ri River (Ref. 44416).  No picture yet.
Synbranchidae Ophisternon bengalense McClelland, 1844 Fr native  Lich (Vietnamese)  100.00 cm TL male/unsexed  Found in Mekong delta (Ref. 12693). Also Ref. 36625. 
Xenocyprididae Opsariichthys bea Nguyen, 1987 Fr native      No picture yet.
Xenocyprididae Opsariichthys bidens Günther, 1873 Fr native  Cá Cháo (Vietnamese)  26.10 cm TL male/unsexed  Found in the central and northern Viet Nam. Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Xenocyprididae Opsariichthys dienbienensis Nguyen & Nguyen, 2000 Fr native   12.22 cm SL male/unsexed ;8.64 cm SL female  Found in northern Viet Nam (Ref. 95038).  No picture yet.
Xenocyprididae Opsariichthys duchuunguyeni Huynh & Chen, 2014 Fr native   7.25 cm SL male/unsexed ;6.10 cm SL female  Known from the Bang Giang river in Cao Bang province and Ky Cung river in Lang Son province, both are tributaries of Pearl river (Ref. 95038). 
Xenocyprididae Opsariichthys hieni Nguyen, 1987 Fr native    Typ locality, Huong Son, Nghe-Tinh [Tin] Province, Vietnam (Ref. 81932).  No picture yet.
Xenocyprididae Opsariichthys songmaensis Nguyen & Nguyen, 2000 Fr native   10.50 cm SL male/unsexed ;7.49 cm SL female  Known from the Ma River (Ref. 95038).  No picture yet.
Danionidae Opsarius pulchellus (Smith, 1931) Fr native   11.00 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Cichlidae Oreochromis mossambicus (Peters, 1852) Fr, Br introduced  Cá Rô Phi đen (Vietnamese)  39.00 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). Also Ref. 3. 
Cichlidae Oreochromis niloticus (Linnaeus, 1758) Fr, Br, Fi, Aq introduced  Cá Rô phi vằn (Vietnamese), Rô phi (Vietnamese)  60.00 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Sisoridae Oreoglanis infulata Ng & Freyhof, 2001 Fr native   10.30 cm SL male/unsexed  Presently known only from one headwater of the Lam River drainage in central Viet Nam (Ref. 49549). Type locality: Ha Tinh province, stream at Son Kim, a tributary of Song Lam (Ref. 49549). Also Ref. 84796.  No picture yet.
Nemacheilidae Oreonectes platycephalus Günther, 1868 Fr native   10.00 cm TL male/unsexed  Observed during the 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). Also Ref. 75196. 
Adrianichthyidae Oryzias curvinotus (Nichols & Pope, 1927) Fr, Br native   4.00 cm TL male/unsexed  Observed in the 1998 survey in Quang Ninh Province as Oryzias cf. curvinotus (Ref. 44416). Also Ref. 27139. 
Adrianichthyidae Oryzias haugiangensis Roberts, 1998 Fr, Br native   2.08 cm SL male/unsexed  Found only in Mekong delta. 
Adrianichthyidae Oryzias javanicus (Bleeker, 1854) Fr native   4.50 cm TL male/unsexed  Known from the Mekong basin. 
Adrianichthyidae Oryzias latipes (Temminck & Schlegel, 1846) Fr native   4.00 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Adrianichthyidae Oryzias pectoralis Roberts, 1998 Fr native   2.23 cm SL male/unsexed  Observed in the 1998 survey in Quang Ninh Province, nothern Vietnam (Ref. 44416). Also Ref. 43281. 
Adrianichthyidae Oryzias sinensis Chen, Uwa & Chu, 1989 Fr native   3.10 cm SL male/unsexed  Expected to occur in the country (Ref. 44416). 
Osphronemidae Osphronemus goramy Lacepède, 1801 Fr, Br native   70.00 cm SL male/unsexed  Occurs in parts of the Mekong delta, where it presumably has been introduced relatively recently. 
Cyprinidae Osteochilus brachynotopteroides Chevey, 1934 Fr native   15.00 cm TL male/unsexed  Known from Kontum Lake in the central highlands of Viet Nam. Also found in Annam (Ref. 26580). Also Ref. 12041. 
Cyprinidae Osteochilus melanopleura (Bleeker, 1852) Fr native  Cá mè hoi (Vietnamese), Cá Mè hôi (Vietnamese)  60.00 cm SL male/unsexed  Occurs in Mekong River. Also Ref. 2091. 
Cyprinidae Osteochilus microcephalus (Valenciennes, 1842) Fr native   24.00 cm SL male/unsexed  Occurs in the Mekong River (Ref. 43281). Also found in Annam (Ref. 26580). Also Ref. 7050, 36654. 
Cyprinidae Osteochilus salsburyi Nichols & Pope, 1927 Fr native   20.10 cm TL male/unsexed  Occurs in northern Viet Nam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 43281. 
Cyprinidae Osteochilus schlegelii (Bleeker, 1851) Fr native  Cá Lúi sọc (Vietnamese), Cá mè huong (Vietnamese)  40.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Cyprinidae Osteochilus vittatus (Valenciennes, 1842) Fr, Br native  Cá lúi soc (Vietnamese), Cá mè lúi (Vietnamese), Cá mè (Vietnamese)  32.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Found in the Mekong delta (Ref. 36625). Known from Annam (Ref. 26580). Also Ref. 43281. 
Cyprinidae Osteochilus waandersii (Bleeker, 1853) Fr native   27.60 cm TL male/unsexed   
Butidae Oxyeleotris marmorata (Bleeker, 1852) Fr, Br native  Cá bong tuong (Vietnamese), Cá Bống tượng (Vietnamese), Cá Bong (Vietnamese)  65.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Butidae Oxyeleotris urophthalmus (Bleeker, 1851) Fr native   28.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Pangasiidae Pangasianodon gigas Chevey, 1931 Fr, Fi, Thr native  Cá Hat (Vietnamese), Cá Tra dầu (Vietnamese) scarce (very unlikely) 300 cm TL male/unsexed ;235 cm SL female  Known from the Mekong basin (Ref. 37770). Also Ref. 2682. Status of threat: Rare (Ref. 46452). 
Pangasiidae Pangasianodon hypophthalmus (Sauvage, 1878) Fr, Br, Aq native  Cá Tra (Vietnamese), Cá Tra yêu (Vietnamese)  130 cm SL male/unsexed  Known from the Mekong basin. Migrates downstream from May to August from Stung Treng to Kandal in Cambodia and further into the Mekong Delta in Viet Nam, at least to Cai Be. This downstream migration is both a spawning and a trophic migration eventually bringing the fish onto floodplain areas during the flood season. At Ang Giang and Dong Thap Provinces, larvae occur every year in June-July during their downstream drift from spawning site somewhere upstream in Cambodia. They are fished in specialized larvae dai nets just south of the Cambodian-Viet Namese border and are used as stocking materials in the cage culture industry. Fish larvae of 2 cm are reported in May-July. Generally, fish from the Mekong Delta are below 50 cm, dominated by fish below 30 cm (Ref. 37770). Also Ref. 49196. 
Pangasiidae Pangasius bocourti Sauvage, 1880 Fr native  Cá Ba sa (Vietnamese), Cá Basa bocourti (Vietnamese)  120 cm SL male/unsexed  Known from the Mekong River. Undertakes upstream migration beginning in November when the water level within the river decreases and continues well into the dry seaon, at least until February. In the late dry season, or the start of the monsoon season, a downstream migration takes place from the Khone Falls to the Mekong Delta (Ref. 37770). Also Ref. 37770, 43281. 
Pangasiidae Pangasius conchophilus Roberts & Vidthayanon, 1991 Fr native   120 cm SL male/unsexed 37 TL Known from the Mekong Delta at Hong Ngu in Dong Thap Province and at Thot Not in Can Tho Province. Juveniles of 2 cm appear in June and the end of the year they have grown to about 20 cm. Also Ref. 43281, 49196. 
Pangasiidae Pangasius djambal Bleeker, 1846 Fr native   90.00 cm TL male/unsexed  Known from the Mekong. 
Pangasiidae Pangasius elongatus Pouyaud, Gustiano & Teugels, 2002 Fr native  Cá dúa (Vietnamese) common (usually seen) 28.20 cm SL male/unsexed  Known from the Mekong basin (Ref. 7432) and southern Vietnam (Ref. 9706). At My Tho town, Tien Giang Province, this species migrate upstream from the Mekong Delta, mainly triggered by the receding water levels at the end of the flood season (Ref. 37770). Also Ref. 36625, 46915.  No picture yet.
Pangasiidae Pangasius krempfi Fang & Chaux, 1949 Fr, Br, M native  scarce (very unlikely) 120 cm SL male/unsexed  Known from rivers along the Viet Nam coast (Ref. 12693). Recorded from the River Hue, Annam (Ref. 7432). Found in Southern Vietnam (Ref. 9706). Occurs sympatrically with P. kunyit in the Mekong delta (Ref. 33567). Undertakes upstream migration in November-February and downstream migration from April to July at Cao Lanh in Dong Thap Province of the Mekong basin, both movements involving mainly big fishes of 70 to 90 cm (Ref. 37770). Also distributed in brackish water (Ref. 49196). Also Ref. 12369, 49196. 
Pangasiidae Pangasius kunyit Pouyaud, Teugels & Legendre, 1999 Fr, Br, Fi native   70.20 cm SL female  Recorded from the Mekong delta. It is considered as a candidate for aquaculture and its reproduction in captivity has already been achieved. Also distributed in brackish water (Ref. 49196). 
Pangasiidae Pangasius larnaudii Bocourt, 1866 Fr, Aq native  Cá vo dèm (Vietnamese), Cá Vồ dém (Vietnamese)  130 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Below the Khone Falls from Dong Thap Province to the Khone Falls, it migrates upstream at the start of the dry the season, triggered by the receding water levels (Ref. 37770). Also Ref. 36625, 37770. 
Pangasiidae Pangasius macronema Bleeker, 1850 Fr native  Cá Tra Xiêm (Vietnamese), Cá xác soc (Vietnamese)  30.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Generally occurs throughout the year in varying abundance, more abundant during the migration period (Ref. 37770). Reported to migrate downstream from July to November (Ref. 37770). Also Ref. 43281, 49196. 
Pangasiidae Pangasius mekongensis Gustiano, Teugels & Pouyaud, 2003 Fr, Br native    Type locality, Binh Dai, Mekong Delta (Ref. 50838). Also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Pangasiidae Pangasius nasutus (Bleeker, 1863) Fr native  Cá hú (Vietnamese)  90.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Pangasiidae Pangasius pangasius (Hamilton, 1822) Fr, Aq introduced  Cá ba sa (Vietnamese), Cá xanh ky (Vietnamese)  300 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Pangasiidae Pangasius polyuranodon Bleeker, 1852 Fr, Br, M native   80.00 cm SL male/unsexed  Found in lower Mekong River. 
Pangasiidae Pangasius sanitwongsei Smith, 1931 Fr, Fi native  Cá vô cò (Vietnamese), Cá Vồ cờ (Vietnamese) scarce (very unlikely) 300 cm SL male/unsexed  Found in the Mekong River (Ref. 36625). Migratory; upstream Mekong. Also Ref. 2682, 43281. 
Cobitidae Pangio anguillaris (Vaillant, 1902) Fr native   12.00 cm SL male/unsexed  Known from the lower Mekong basin (Ref. 13770). Also Ref. 27732, 36654. 
Cobitidae Pangio oblonga (Valenciennes, 1846) Fr native   8.00 cm TL male/unsexed   
Tetraodontidae Pao cochinchinensis (Steindachner, 1866) Fr native   11.28 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). Museum: canal near Xano, Vi-Thanh, Rach-Gia Prov., MNHN 1940-42 (holotype, 5.44 cm SL) (Ref. 27732). 
Tetraodontidae Pao fangi (Pellegrin & Chevey, 1940) Fr native    Known from Xano canal, Vi-Thanh, Rach-Gia Province, Cochinchine (Ref. 94476).  No picture yet.
Tetraodontidae Pao leiurus (Bleeker, 1850) Fr native   16.00 cm male/unsexed  Found in Canal de Xano, Rach Gia. 
Gobiidae Papuligobius ocellatus (Fowler, 1937) Fr native  Cá Bống chấm (Vietnamese)  12.00 cm SL male/unsexed  Present in Dakrong River (Ref. 89722). 
Botiidae Parabotia dubius Kottelat, 2001 Fr native    Found in Thac Ba, northern Vietnam (Ref. 44416).  No picture yet.
Botiidae Parabotia kimluani Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Botiidae Parabotia vancuongi Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Xenocyprididae Parabramis pekinensis (Basilewsky, 1855) Fr native   55.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). 
Xenocyprididae Parachela maculicauda (Smith, 1934) Fr native   6.00 cm TL male/unsexed   
Xenocyprididae Parachela oxygastroides (Bleeker, 1852) Fr native  Cá lành canh (Vietnamese)  20.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 2686. 
Nemacheilidae Paracobitis hagiangensis Nguyen, 2005 Fr native    Found in Hà Giang (Ref. 84796).  No picture yet.
Nemacheilidae Paracobitis phongthoensis Nguyen, 2005 Fr native    Found in Phong Thô, Lai Châu (Ref. 84796).  No picture yet.
Xenocyprididae Paralaubuca riveroi (Fowler, 1935) Fr native  Cá thiêu (Vietnamese)  18.00 cm SL male/unsexed   Found in Mekong delta (Ref. 36625). 
Xenocyprididae Paralaubuca typus Bleeker, 1864 Fr native   18.00 cm SL male/unsexed  Occurs in the Mekong delta. From the Mekong delta, when the water levels rise this species moves up into canals and then onto flooded areas. When the water recedes, it returns through canals to the mainstream (Ref. 37770). Known from the Mekong river in Cochinchine (Ref. 33021). 
Ambassidae Parambassis apogonoides (Bleeker, 1851) Fr native   10.00 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). 
Ambassidae Parambassis siamensis (Fowler, 1937) Fr native  Cá son gián (Vietnamese), Cá Sơn gián (Vietnamese)  7.50 cm SL male/unsexed  Found in the Mekong basin. 
Ambassidae Parambassis wolffii (Bleeker, 1850) Fr native  occasional (usually not seen) 20.00 cm SL male/unsexed  Known from the Gulf of Tonkin and from central and southern Vietnam (Ref. 12846) but this has to be verified because Ref. 12846 is a checklist of marine fishes in the country. Occurs in the Mekong basin (Ref. 43281). 
Gastromyzontidae Parasewellia monolobata Nguyen & Nguyen, 2005 Fr native    Found in Quang Nam (Ref. 84796).  No picture yet.
Gastromyzontidae Parasewellia polylobata Nguyen & Nguyen, 2005 Fr native    Found in Quang Nam (Ref. 84796).  No picture yet.
Gastromyzontidae Parasewellia tetralobata Nguyen & Nguyen, 2005 Fr native    Found in Quang Nam (Ref. 84796).  No picture yet.
Cyprinidae Paraspinibarbus macracanthus (Pellegrin & Chevey, 1936) Fr native    Known from South Annam and Ben Yai Province (Ref. 94476).  No picture yet.
Gobionidae Parasqualidus maii Doi, 2000 Fr native    Type locality, Vugia River, near Ha Tan, Da Nang, central Vietnam, NSMT-P 58547 (holotype of Parasqualidus maii) (Ref. 50851).  No picture yet.
Cyprinidae Parator zonatus (Lin, 1935) Fr native    Found in northern Vietnam (Ref. 44416). 
Xenocyprididae Parazacco fasciatus (Koller, 1927) Fr native   13.40 cm SL male/unsexed  Known from Quang Ninh and Lo River basin (Ref. 44416). Recorded from the upper Ngan Truoi and Ngan Pho rivers (Ref. 26642). Present in Da River (Ref. 90167, 89724).  No picture yet.
Xenocyprididae Parazacco spilurus (Günther, 1868) Fr native   11.00 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Sisoridae Pareuchiloglanis brevicaudatus Nguyen, 2005 Fr native      No picture yet.
Sisoridae Pareuchiloglanis macrotrema (Norman, 1925) Fr native   16.00 cm SL male/unsexed  Reported from Ngoi Tio, lao Cai anda Ta Chung Ha, Lao Cai (Ref. 44416). Also Ref. 4833, 37037.  No picture yet.
Sisoridae Pareuchiloglanis namdeensis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Sisoridae Pareuchiloglanis nebulifera Ng & Kottelat, 2000 Fr native   9.60 cm SL male/unsexed  Since it occurs in Nam Xam and Nam Ma basins in Laos; it is expected to occur in adjacent areas of Vietnam (Ref. 44416).  No picture yet.
Sisoridae Pareuchiloglanis poilanei Pellegrin, 1936 Fr native    Found in coastal streams of Annam. Also Ref. 37037. 
Sisoridae Pareuchiloglanis rhabdura Ng, 2004 Fr native    Known from Red River (Song Hong) drainage in northern Vietnam (Ref. 53228).  No picture yet.
Sisoridae Pareuchiloglanis songdaensis Nguyen & Nguyen, 2001 Fr native    Known from Red River drainage in northern Vietnam (Ref. 57846).  No picture yet.
Sisoridae Pareuchiloglanis songmaensis Nguyen & Nguyen, 2001 Fr native    Known from Song Ma drainage in northern Vietnam (Ref. 57846).  No picture yet.
Sisoridae Pareuchiloglanis tamduongensis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Bagridae Pelteobagrus intermedius (Nichols & Pope, 1927) Fr native   17.30 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416).  No picture yet.
Bagridae Pelteobagrus tonkinensis Nguyen, 2005 Fr native      No picture yet.
Cyprinidae Percocypris tchangi (Pellegrin & Chevey, 1936) Fr native    Known from Muong Hum, Lao Cai in northern Vietnam (Ref. 44416).  No picture yet.
Oxudercidae Periophthalmodon schlosseri (Pallas, 1770) Fr, Br, Fi native  Cá thòi lòi (Vietnamese), Cá Thòi lòi sơ - lốt - sơ (Vietnamese)  27.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Marketed live (Ref. 12693). 
Oxudercidae Periophthalmus modestus Cantor, 1842 Fr, Br, M native  Shuttles hoppfish (English), Cá Thoi loi (Vietnamese)  10.00 cm TL male/unsexed  Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). Also Ref. 58534. 
Siluridae Phalacronotus bleekeri (Günther, 1864) Fr native  Cá ket (Vietnamese), Cá Kết (Vietnamese)  60.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 36654, 43281. 
Phallostethidae Phallostethus cuulong Shibukawa, Tran & Tran, 2012 Fr native  Cá bụng đầu (Vietnamese)  24.50 cm SL male/unsexed  Found in Soc Trang and Tra Vinh Provinces (Ref. 90869).  No picture yet.
Ophichthidae Pisodonophis boro (Hamilton, 1822) Fr, Br, M native  Cá Nhệch răng hạt (Vietnamese) common (usually seen) 100.00 cm TL male/unsexed  Occurs in the Mekong delta (Ref. 12693). Known from the Gulf of Tonkin and southern Vietnam (Ref. 9706). Also Ref. 7050. 
Cyprinidae Placocheilus bibarbatus Nguyen, 2001 Fr native    Type locality, Tam Duòng, Phong Thô, Lai Châu (Ref. 56787).  No picture yet.
Cyprinidae Placocheilus caudofasciatus (Pellegrin & Chevey, 1936) Fr native   10.90 cm SL male/unsexed  Occurs in the Red River basin in Viet Nam (Ref. 43281). Type locality: Noire (Song Da) River at Lai Chau (Ref. 33021). Present in Da River (Ref. 90167, 89724).  No picture yet.
Gobionidae Placogobio bacmeensis Nguyen & Vo, 2001 Fr native    Type locality, Sông Gâm, Bác Mê Co., tinh Hà Giang (Ref. 56787).  No picture yet.
Gobionidae Placogobio nahangensis Nguyen, 2001 Fr native    Type locality, Thác Mo, sông Gâm system, Na Hang, Tuyên Quang (Ref. 56787).  No picture yet.
Mugilidae Planiliza haematocheilus (Temminck & Schlegel, 1845) Fr, Br, M native  fairly common (chances are about 50%) 80.00 cm TL male/unsexed  Known from the Gulf of Tonkin (Ref. 9706) and Quang Ninh-Cat Ba (Ref. 58534). 
Mugilidae Planiliza macrolepis (Smith, 1846) Fr, Br, M native  Cá Đối vảy to (Vietnamese), Largescale mullet (English) scarce (very unlikely) 60.00 cm SL male/unsexed  Known from the Gulf of Tonkin and Central Vietnam (Ref . 9706); also from Quang Ninh-Cat Ba (Ref. 58534). 
Plecoglossidae Plecoglossus altivelis (Temminck & Schlegel, 1846) Fr, Br native   70.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 41299). 
Plotosidae Plotosus canius Hamilton, 1822 Fr, Br, M native  Cá ngát (Vietnamese), Cá Ngát nanh (Vietnamese) common (usually seen) 111 cm TL male/unsexed  Found in Southern Vietnam (Ref. 9706); in Mekong delta (Ref. 36625), and also from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). Also Ref. 3478, 36654, 12693. 
Poeciliidae Poecilia reticulata Peters, 1859 Fr introduced  Cá bay màu (Vietnamese)  5.00 cm SL male/unsexed ;6.00 cm SL female  Found in Mekong delta (Ref. 36625). 
Poeciliidae Poecilia velifera (Regan, 1914) Fr introduced   15.00 cm TL male/unsexed   
Polynemidae Polynemus aquilonaris Motomura, 2003 Fr native   15.80 cm SL male/unsexed  Occurs in southern Viet Nam, in the Mekong River system (Ref. 49954, 57343). 
Polynemidae Polynemus bidentatus Motomura & Tsukawaki, 2006 Fr native   15.34 cm SL male/unsexed  Type locality, Cho Gao Canal in Mekong River drainage, My Tho Province, UMMZ 213346 (holotype of Polynemus bidentatus, 15.34 cm SL, male) (Ref. 58087). Also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Polynemidae Polynemus dubius Bleeker, 1853 Fr native  Cá Chét vây ngực dài (Vietnamese), Cá Phèn trắng (Vietnamese), Cá phèn vàng (Vietnamese)  20.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 43281. 
Polynemidae Polynemus melanochir Valenciennes, 1831 Fr, Br, M native  scarce (very unlikely) 25.00 cm SL male/unsexed  Found in the Mekong River system at least as far as Can Tho, Viet Nam and from the Bassac River at least as far as My Tho (Ref. 9685). Occurs in the southern Viet Nam (Ref. 9706). Also Ref. 57343. 
Cyprinidae Poropuntius alloiopleurus (Vaillant, 1893) Fr native   40.00 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416) and Annam (Ref. 26580). Found in the Red River (Ref. 43281, 45536). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Poropuntius brevispinus (Nguyen & Doan, 1969) Fr native      No picture yet.
Cyprinidae Poropuntius deauratus (Valenciennes, 1842) Fr native   16.95 cm TL male/unsexed  Known from Annam (Ref. 26580). Museum: 30 km west of Hue, creek Mau, Huong basin, CMK 16016 (Ref. 36949). Also Ref. 12693, 36654. 
Cyprinidae Poropuntius kontumensis (Chevey, 1934) Fr native   20.00 cm TL male/unsexed  Found in the Mekong basin (Ref. 12693). Known from Sai Gon River basin, a large mountain stream tributary of Da Dung and Song Dong Nai south of Ban Ma Thout at Cau Daktik. Type locality: Kontum Lake near Pleiku, central Viet Nam. 
Cyprinidae Poropuntius krempfi (Pellegrin & Chevey, 1934) Fr native   13.00 cm SL male/unsexed  Recorded from the Red River basin in northern Viet Nam (Ref. 43281). Type locality: Nghia Lo, Tonkin (Ref. 35912). Present in Da River (Ref. 90167, 89724).  No picture yet.
Pristidae Pristis microdon Latham, 1794 Fr, Br, M, Thr native  Cá Dao (Vietnamese), Cá Dao răng nhỏ (Vietnamese) scarce (very unlikely) 700 cm TL male/unsexed  Known from the coast of Central Vietnam (Ref. 9705). Also Ref. 9859. Status of threat: Rare (Ref. 46452). 
Pristidae Pristis zijsron Bleeker, 1851 Fr, Br, M native  Cá Dao đuôi nhỏ (Vietnamese)  730 cm TL male/unsexed   
Pristolepididae Pristolepis fasciata (Bleeker, 1851) Fr native  Cá rô bien (Vietnamese)  31.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 36625, 36654. 
Cyprinidae Probarbus jullieni Sauvage, 1880 Fr, Br native  Cá chài sóc (Vietnamese), Cá Trà sóc (Vietnamese), Cá trà soc (Vietnamese)  150 cm SL male/unsexed  Occurs in the Mekong River tributaries. Also Ref. 37770. 
Prochilodontidae Prochilodus lineatus (Valenciennes, 1837) Fr introduced   80.00 cm TL male/unsexed  Recorded from the Red River basin in Lang Son and Cao Bang Provinces, assumed to have escaped from aquaculture (Ref. 95066). 
Cyprinidae Procypris mera Lin, 1933 Fr, Thr native    Found in northern Vietnam (Ref. 44416). Status of threat: Endangered (Ref. 46452). 
Salangidae Protosalanx chinensis (Basilewsky, 1855) Fr native   21.00 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Species identification needs confirmation (Ref. 44416). 
Oxudercidae Pseudapocryptes elongatus (Cuvier, 1816) Fr, Br, M native  Cá Bống kèo (Vietnamese)  20.00 cm TL male/unsexed 16.3 TL  
Sisoridae Pseudecheneis maurus Ng & Tan, 2007 Fr native   5.48 cm SL male/unsexed  Known from the Song Thuy Loan drainage in central Vietnam (Ref. 57940).  No picture yet.
Sisoridae Pseudecheneis paviei Vaillant, 1892 Fr native   13.20 cm SL male/unsexed  Known from Lai Chau, northern Vietnam (Ref. 44416). Found in the Red River drainage (Ref. 74729). Present in Da River (Ref. 90167, 89724).  No picture yet.
Akysidae Pseudobagarius similis (Ng & Kottelat, 1998) Fr native   5.10 cm SL male/unsexed  Known from the mouth of the Mekong basin in southern Viet Nam (Ref. 30226); in Kinh Thuy Cai canal, 10 km east of Vinh Long, at mouth of canal into Mekong (Ref. 33021); from Song Hau Giang, a branch of the Mekong River also known as the Bassac River (Ref. 87929). 
Bagridae Pseudobagrus kyphus Mai, 1978 Fr native   7.26 cm SL male/unsexed  Found in rivers flowing into Beibu Gulf (Gulf of Tonkin): the Song Hong R. basin, northern part of Vietnam (Ref. 45051). Present in Da River (Ref. 90167, 89724). Also Ref. 44416. 
Bagridae Pseudobagrus nubilosus Ng & Freyhof, 2007 Fr native   5.08 cm SL male/unsexed  Found in the Song Vinh Tranh drainage in Binh Dinh province, central Vietnam (Ref. 57972).  No picture yet.
Bagridae Pseudobagrus vachellii (Richardson, 1846) Fr native   42.30 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Gastromyzontidae Pseudogastromyzon buas (Mai, 1978) Fr native    Known from northern Viet Nam (Ref. 44416).  No picture yet.
Gastromyzontidae Pseudogastromyzon daon (Mai, 1978) Fr native   3.20 cm SL male/unsexed  Known from Phong Tho and Nam Na stream in Lai Chau, northern Vietnam (Ref. 44416).  No picture yet.
Gastromyzontidae Pseudogastromyzon elongatus (Mai, 1978) Fr native    Found in northern Vietnam (Ref. 44416).  No picture yet.
Gastromyzontidae Pseudogastromyzon fasciatus (Sauvage, 1878) Fr native   8.20 cm SL male/unsexed  Type locality, Tonkin, elev. 1200 m (Ref. 46206). 
Gastromyzontidae Pseudogastromyzon loos (Mai, 1978) Fr native    Found in Lo River basin, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Gobionidae Pseudogobio banggiangensis Nguyen, 2001 Fr native    Type locality, Sông Bàng, Cao Bàng (Ref. 56787).  No picture yet.
Gobiidae Pseudogobius melanosticta (Day, 1876) Fr, Br native   4.00 cm SL male/unsexed    No picture yet.
Gobiidae Pseudogobius poicilosoma (Bleeker, 1849) Fr native   6.50 cm TL male/unsexed  Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). 
Xenocyprididae Pseudohemiculter dispar (Peters, 1881) Fr native  Tép dầu (Vietnamese)  29.10 cm TL male/unsexed  Occurs in central and northern Viet Nam (Ref. 43281). Present in Da River (Ref. 90167, 89724). 
Xenocyprididae Pseudohemiculter hainanensis (Boulenger, 1900) Fr native   24.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Xenocyprididae Pseudohemiculter pacboensis Nguyen, 2001 Fr native    Type locality, Suôi Lê Nin, Hang Pác Bó, Cao Bang Prov. (Ref. 56787).  No picture yet.
Pangasiidae Pseudolais micronemus (Bleeker, 1846) Fr, Aq native   100.00 cm male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 4537, 43281. 
Pangasiidae Pseudolais pleurotaenia (Sauvage, 1878) Fr native  Cá xác bau (Vietnamese)  35.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 43281, 49196. 
Xenocyprididae Pseudolaubuca hotaya Mai, 1978 Fr native    Found in northern Vietnam (Ref. 44416). Type locality, Tây Lake, n. Vietnam (Ref. 46206).  No picture yet.
Xenocyprididae Pseudolaubuca sinensis Bleeker, 1864 Fr native   29.20 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Bagridae Pseudomystus siamensis (Regan, 1913) Fr native  Cá Chốt bông (Vietnamese), Cá chot chuot (Vietnamese)  18.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Bagridae Pseudomystus sobrinus Ng & Freyhof, 2005 Fr native   6.23 cm SL male/unsexed  Known from Song Ba and the small drainages around it, which drains the eastward slope of the Annam Cordillera into the South China Sea.  No picture yet.
Gobionidae Pseudorasbora parva (Temminck & Schlegel, 1846) Fr introduced   12.50 cm TL male/unsexed  Known from the Ta Van River (22°18′ N, 103°54′ E), right tributary of the Red River, Hoang Lien Shon National Park in Lao Kai Province (Ref. 95134). 
Siluridae Pterocryptis cochinchinensis (Valenciennes, 1840) Fr native  Cá thèo (Vietnamese)  40.10 cm TL male/unsexed  Known only from the coastal drainages in central Vietnam immediately south of Vinh to An Lao (Ref. 41525). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 36654, 43281. 
Siluridae Pterocryptis crenula Ng & Freyhof, 2001 Fr native   12.52 cm SL male/unsexed  Known only from northeastern Vietnam.  No picture yet.
Siluridae Pterocryptis cucphuongensis (Mai, 1978) Fr native   9.04 cm SL male/unsexed  Known only from Song Iuong drainage in northern Vietnam (Ref. 41525). Also Ref. 33585.  No picture yet.
Siluridae Pterocryptis verecunda Ng & Freyhof, 2001 Fr native   13.16 cm SL male/unsexed  Known only from Cat Ba Island in northeastern Vietnam (Ref. 41525).  No picture yet.
Cyprinidae Puntigrus partipentazona (Fowler, 1934) Fr native   6.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 36654. 37831, 43281. 
Cyprinidae Puntioplites bulu (Bleeker, 1851) Fr native  Cá danh bong (Vietnamese)  44.30 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Cyprinidae Puntioplites falcifer Smith, 1929 Fr native   40.00 cm male/unsexed  Occurs in the Mekong. Known to spawn in small streams and in ricefields. Based on one report , this species undertakes upstream migration in Tien Giang Province in July. It migrates downstream in October-December. 
Cyprinidae Puntioplites proctozystron (Bleeker, 1865) Fr native  Cá danh (Vietnamese)  44.00 cm TL male/unsexed  Known from the Mekong (Ref. 36625). Also Ref. 12693, 43281, 45563. 
Cyprinidae Puntioplites waandersi (Bleeker, 1859) Fr native   50.00 cm TL male/unsexed  Known from the Mekong basin (Ref. 12693). 
Cyprinidae Puntius brevis (Bleeker, 1849) Fr, Br native  Cá ram (Vietnamese)  14.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Found in Mekong delta (Ref. 36625). Also Ref. 36625. 
Cyprinidae Puntius takhoaensis Nguyen & Doan, 1969 Fr native    Found in Suoi Nan Ta Khoa, Son La in northern Vietnam (Ref. 44416).  No picture yet.
Danionidae Raiamas guttatus (Day, 1870) Fr native   30.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 36654, 43281. 
Danionidae Rasbora aurotaenia Tirant, 1885 Fr native  Cá lòng tong da (Vietnamese)  15.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 43281). 
Danionidae Rasbora borapetensis Smith, 1934 Fr native   10.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 27732). Also Ref. 36654. 
Danionidae Rasbora daniconius (Hamilton, 1822) Fr native   15.00 cm TL male/unsexed   
Danionidae Rasbora dusonensis (Bleeker, 1850) Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong basin. 
Danionidae Rasbora lateristriata (Bleeker, 1854) Fr native  Cá lòng tong dá (Vietnamese)  12.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Danionidae Rasbora paviana Tirant, 1885 Fr native   12.00 cm SL male/unsexed  Occurs in the Mekong basin. 
Danionidae Rasbora rubrodorsalis Donoso-Büchner & Schmidt, 1997 Fr native   3.30 cm SL male/unsexed   
Danionidae Rasbora steineri Nichols & Pope, 1927 Fr native   10.00 cm TL male/unsexed  Occurs in central and northern Viet Nam (Ref. 43281). 
Danionidae Rasbora sumatrana (Bleeker, 1852) Fr native   13.00 cm TL male/unsexed   
Danionidae Rasbora vietnamensis Vasil'eva & Vasil’ev, 2013 Fr native   3.90 cm TL male/unsexed  Found in Phu Quoc Island (Ref. 93745).  No picture yet.
Cyprinidae Rectoris mutabilis (Lin, 1933) Fr native   15.54 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416).  No picture yet.
Cyprinidae Rectoris posehensis Lin, 1935 Fr native   23.00 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Gobiidae Redigobius chrysosoma (Bleeker, 1875) Fr native   4.90 cm TL male/unsexed  Reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Gobiidae Rhinogobius boa Chen & Kottelat, 2005 Fr native    Known from the river running into the Gulf of Tonkin in northern Vietnam (Ref. 56949).  No picture yet.
Gobiidae Rhinogobius brunneus (Temminck & Schlegel, 1845) Fr native   5.80 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Gobiidae Rhinogobius cliffordpopei (Nichols, 1925) Fr native   14.50 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Gobiidae Rhinogobius duospilus (Herre, 1935) Fr native   6.20 cm SL male/unsexed  Observed during a 1998 survey in Quang Ninh Province and a 1999 survey of the Lo River basin in northern Vietnam (Ref. 44416). 
Gobiidae Rhinogobius giurinus (Rutter, 1897) Fr native  Cá Bống cát (Vietnamese), Cá Bống khe (Vietnamese)  12.10 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Gobiidae Rhinogobius honghensis Chen, Yang & Chen, 1999 Fr native   4.50 cm SL male/unsexed  Observed during a 1999 survey of the Lo River basin (Ref. 44416). Also known from the Red River basin (Ref. 43281).  No picture yet.
Gobiidae Rhinogobius imfasciocaudatus Nguyen & Vo, 2005 Fr native    Found in Lai Chau (Ref. 84797).  No picture yet.
Gobiidae Rhinogobius leavelli (Herre, 1935) Fr native   8.80 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Occurs in the Red River basin (Ref. 43281).  No picture yet.
Gobiidae Rhinogobius longipinnis Nguyen & Vo, 2005 Fr native    Found in Tuyen Quang and Thai Nguyen(Ref. 84797).  No picture yet.
Gobiidae Rhinogobius similis Gill, 1859 Fr native   10.00 cm TL male/unsexed ;6.58 cm SL female  Known from northern Vietnam (Ref. 104791). 
Gobiidae Rhinogobius sulcatus Chen & Kottelat, 2005 Fr native    Known from northern Vietnam (Ref. 56949).  No picture yet.
Gobiidae Rhinogobius variolatus Chen & Kottelat, 2005 Fr native    Known from northern Vietnam (Ref. 56949).  No picture yet.
Gobiidae Rhinogobius virgigena Chen & Kottelat, 2005 Fr native    Known from northern Vietnam (Ref. 56949).  No picture yet.
Acheilognathidae Rhodeus rheinardti (Tirant, 1883) Fr native    Type locality: Hué, Vietnam (Ref. 33021). Also recorded from Annam (Ref. 26580).  No picture yet.
Acheilognathidae Rhodeus spinalis Oshima, 1926 Fr native   10.00 cm TL male/unsexed  Expected to occur in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 94476.  No picture yet.
Salangidae Salanx chinensis (Osbeck, 1765) Fr, Br, M native  Cá Ngãn Trung hoa (Vietnamese) occasional (usually not seen) 16.10 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Known from the Gulf of Tonkin (Ref. 9706). Present in Da River (Ref. 90167, 89724). 
Salangidae Salanx cuvieri Valenciennes, 1850 Fr native  Cá Ngãn (Vietnamese)  15.30 cm SL male/unsexed  Material tentatively refers to S. cuvieri (Ref. 44416).  No picture yet.
Gobionidae Sarcocheilichthys caobangensis Nguyen & Vo, 2001 Fr native   6.93 cm SL male/unsexed  Type locality of Sarcocheilichthys caobangensis, Cao Bàng, Cao Bàng Province (Ref. 56787).  No picture yet.
Gobionidae Sarcocheilichthys hainanensis Nichols & Pope, 1927 Fr native   9.00 cm SL male/unsexed  Occurs in northern Vietnam (Ref. 44416). Also Ref. 43281.  No picture yet.
Gobionidae Saurogobio dabryi Bleeker, 1871 Fr native   27.30 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Gobionidae Saurogobio immaculatus Koller, 1927 Fr native   14.90 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Cyprinidae Scaphiodonichthys acanthopterus (Fowler, 1934) Fr native   31.00 cm SL male/unsexed  Known from Nam Na and Nam Lay in Lai Chau, northern Vietnam (Ref. 44416). Found in the Mekong basin (Ref. 43281). Also Ref. 12693. 
Cyprinidae Scaphiodonichthys burmanicus Vinciguerra, 1890 Fr native   22.00 cm TL male/unsexed   
Cyprinidae Scaphiodonichthys macracanthus (Pellegrin & Chevey, 1936) Fr native   20.50 cm SL male/unsexed  Known from Hong River basin in northern Vietnam (Ref. 44416).  No picture yet.
Cyprinidae Scaphognathops stejnegeri (Smith, 1931) Fr native   25.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 36654. 
Scatophagidae Scatophagus argus (Linnaeus, 1766) Fr, Br, M, Lf native  Cá Nâu (Vietnamese), Cá Nầu (Vietnamese), Spotted scat (English), Ca hoi (Vietnamese), Cá nào (Vietnamese), Ca nau (Vietnamese), Cá nau (Vietnamese), Cá nú (Vietnamese) common (usually seen) 45.00 cm TL male/unsexed  Known from Mekong delta (Ref. 12693), Gulf of Tonkin and central Vietnam (Ref. 12846); also from Quang Ninh-Cat Ba and Nha Trang (Ref. 58534). Also Ref. 2682, 36625. 
Nemacheilidae Schistura antennata Freyhof & Serov, 2001 Fr native   7.36 cm SL male/unsexed  Recorded from the catchment of the River Lam which drains to the Vietnamese coast and enter the sea near the city of Vinh.  No picture yet.
Nemacheilidae Schistura bachmaensis Freyhof & Serov, 2001 Fr native   5.66 cm SL male/unsexed  Type locality: Stream Suoi Voi at Thua Luu, 55 km south of Hue, 16°14.58'N, 107°59.39'E, Thua Thien Province.  No picture yet.
Nemacheilidae Schistura callichroma (Zhu & Wang, 1985) Fr native    Expected to occur in northern, Vietnam (Ref. 44416).  No picture yet.
Nemacheilidae Schistura carbonaria Freyhof & Serov, 2001 Fr native   7.22 cm SL male/unsexed  Type locality: Stream Khe Vinh An at Nam Dong village ca. 40 km south of Hue, 16°11.58'N, 107°43.76'E, Thua Thien Province. Recorded from the River Ve, Thra Kuc Huong, River Thu Bon and River Quang Tri which drain to the Vietnamese coast.  No picture yet.
Nemacheilidae Schistura caudofurca (Mai, 1978) Fr native   8.10 cm SL male/unsexed  Found in Nam Cong, Song Ma, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Nemacheilidae Schistura chapaensis (Rendahl, 1944) Fr native    Found during the 1999 survey of the Lo River basin, northern Vietnam (Ref. 44416).  No picture yet.
Nemacheilidae Schistura dalatensis Freyhof & Serov, 2001 Fr native   8.72 cm SL male/unsexed  Type locality: River Dai Tan ca. 30 km south of Da Lat, 11°46.64'N, 108°19.28'E, Lam Dong Province.  No picture yet.
Nemacheilidae Schistura fasciolata (Nichols & Pope, 1927) Fr native  Cá Chạch suối sọc (Vietnamese)  12.00 cm TL male/unsexed  Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Nemacheilidae Schistura finis Kottelat, 2000 Fr native   9.00 cm SL male/unsexed  Occurs in the stream forming the border between Laos and Vietnam near Nam Ca (Ref. 44416).  No picture yet.
Nemacheilidae Schistura hingi (Herre, 1934) Fr native   9.72 cm SL male/unsexed  Known from the basins of River Giang which enter the sea at the city of Dong Hoi, the River Rao Nay and the River Lam or Ca which has its estuary near the city of Vinh (Ref. 40772)  No picture yet.
Nemacheilidae Schistura hoai (Nguyen, 2005) Fr native    Known from the Nua Ngam, Nam Ngam stream, Mekong drainage in Dien Bien, Dien Bien Province (Ref. 92804).  No picture yet.
Nemacheilidae Schistura huongensis Freyhof & Serov, 2001 Fr native   6.28 cm SL male/unsexed  Occurs in the catchment of the River Huong, which drains to the Vietnamese coast and enters the sea near the city of Hue, and in the River Cam Lo, which also drains to the Vietnamese coast and enters the sea near the city of Dong Ha. Type locality: Stream Khe Vinh An at Nam Dong village ca. 40 km south of Hue, 16°11.58'N, 107°43.76'E, Thua Thien Province (Ref. 40772).  No picture yet.
Nemacheilidae Schistura implicata Kottelat, 2000 Fr native   8.69 cm SL male/unsexed  Occurs in coastal drainage of the River Ca or Lam, which enter the sea at the city of Vinh (Ref. 40772).  No picture yet.
Nemacheilidae Schistura incerta (Nichols, 1931) Fr native   14.30 cm TL male/unsexed  A species found during 1999 survey of the Lo River basin, northern Vietnam is tentatively identified as Schistura incerta but this needs confirmation (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Nemacheilidae Schistura kongphengi Kottelat, 1998 Fr native   9.07 cm SL male/unsexed  Known from the upper Sekong and Se Banghiang (Ref. 40772).  No picture yet.
Nemacheilidae Schistura kontumensis Freyhof & Serov, 2001 Fr native   5.52 cm SL male/unsexed  Found in headwaters of River Sesan, which drains into the Sekong, a tributary of the Mekong (Ref. 40772). Type locality: Stream Iasia ca. 25 km west of Kontum, 14°23.63N, 107°48.64'E, Kontum Prov.  No picture yet.
Nemacheilidae Schistura melarancia Kottelat, 2000 Fr native   9.60 cm SL male/unsexed  Known from Nua Ngam, Nam Ngam stream, Mekong drainage in Dien Bien, Dien Bien Province (Ref. 92804).  No picture yet.
Nemacheilidae Schistura mobbsi Kottelat & Leisher, 2012 Fr native    Found in Phuong Hoang Cave, about 32 km from Bac Song (Lang Song Prov.), probably draining to Cau River, draining to Hai Phong in Thai Nguyen Province (Ref. 92804).  No picture yet.
Nemacheilidae Schistura namboensis Freyhof & Serov, 2001 Fr native   7.39 cm SL male/unsexed  Found in coastal rivers of southern and central Viet Nam between Quy Nhon and Phan Rang, as well as the upper River Srepok, a tributary of the Sekong, itself a tributary of the Mekong. Also found in the River Sesan, a tributary of the Mekong, based on a single specimen.  No picture yet.
Nemacheilidae Schistura nasifilis (Pellegrin, 1936) Fr native   9.73 cm SL male/unsexed  Found in high altitudes in Rivers Ko and Tan near Nha Trang, Annam. This has not been rediscovered since the collection of the types in 1936 ( Ref. 40772); even with extensive surveys done in 2000 and 2002 in the river, it was still not collected that the known populations are considered to be possibly extinct. Assessed as Critically Endangered in August 11, 2010, with 0-49 mature individuals, with extent of occurrence at 100-120 km², and an ongoing decline in quality of habitat. Further survey is needed within the type locality and possible range to confirm the continued presence and should be reassessed if further populations are found (Ref. 117882). .Also Ref. 12041, 26580, 39226.  No picture yet.
Nemacheilidae Schistura orthocauda (Mai, 1978) Fr native    Identification needs confirmation (Ref. 44416).  No picture yet.
Nemacheilidae Schistura pervagata Kottelat, 2000 Fr native   8.03 cm SL male/unsexed  Known from the Rivers Lam or Ca and Rao Nay which drain to the coast and enter the sea at the city of Vinh and near the city north of Dong Hoi, respectively (Ref. 40772).  No picture yet.
Nemacheilidae Schistura psittacula Freyhof & Serov, 2001 Fr native   6.38 cm SL male/unsexed  Found in rivers Cam Lo and Ben Hai, draining to the Vietnamese coast and entering the sea near the city of Don Ha (Ref. 40772).  No picture yet.
Nemacheilidae Schistura pumatensis Nguyen & Nguyen, 2007 Fr native    Type locality, Pumat National Park, Nghe An Province (Ref. 88798).  No picture yet.
Nemacheilidae Schistura punctatus (Nguyen, 2005) Fr native    Found in Dien Bien (Ref. 84796).  No picture yet.
Nemacheilidae Schistura sokolovi Freyhof & Serov, 2001 Fr native   9.53 cm SL male/unsexed  Found in the coastal drainage of the River Ba and in the rivers Srepok and Sesan, which enter the River Sekong, a tributary of the Mekong River (Ref. 40772).  No picture yet.
Nemacheilidae Schistura sonlaensis (Nguyen, Nguyen & Hoang, 2010) Fr native   6.40 cm SL male/unsexed  Known from the Bom Hau Lake, Chieng Xom Commune, Son La City, at the basin of Da River (Ref. 92114).  No picture yet.
Nemacheilidae Schistura spekuli Kottelat, 2004 Fr native   5.70 cm SL male/unsexed  Found in cave in the center of Chin Chu Chai village in Lai Chau Province (Ref. 52472).  No picture yet.
Nemacheilidae Schistura spiloptera (Valenciennes, 1846) Fr native   5.22 cm SL male/unsexed  Found in a small stream flowing directly to the coast, 30 km south of the type locality (Thua Luu, 50 km SE of Hue, Annam) of Schistura pellegrini but isolated by high mountains (Ref. 40772). Also Ref. 12041, 12693, 26580, 39226. 
Nemacheilidae Schistura susannae Freyhof & Serov, 2001 Fr native   5.18 cm SL male/unsexed  Known from the small coastal drainage of the stream Mong Mo of the southern slopes of Bach Ma mountains (Ref. 40772). 
Nemacheilidae Schistura thanho Freyhof & Serov, 2001 Fr native   8.25 cm SL male/unsexed  Found in the catchment of the River Vinh Thanh or Ha Giao, whose estuary is located in the city of Quy Nhon (Ref. 40772). Also Ref. 95537.  No picture yet.
Nemacheilidae Schistura trilineata (Nguyen, Nguyen & Hoang, 2010) Fr native   3.80 cm SL male/unsexed  Known from the Bom Hau Lake, Chieng Xom Commune, Son La City, at the basin of Da River (Ref. 92114).  No picture yet.
Nemacheilidae Schistura yersini Freyhof & Serov, 2001 Fr native   6.47 cm SL male/unsexed  Known from headwaters of the River Dong Nai, which reaches the sea south of Saigon, and the River Srepok, a tributary of the River Sekong, which is a tributary of the Mekong River (Ref. 40772). Also Ref. 95537.  No picture yet.
Osteoglossidae Scleropages formosus (Müller & Schlegel, 1840) Fr, Thr native  Cá Kim Long (Vietnamese), Cá Rồng (Vietnamese)  90.00 cm TL male/unsexed  Known from southern Vietnam (Ref. 2091). Also Ref. 12693. Status of threat: Endangered (Ref. 46452). 
Scombridae Scomberomorus sinensis (Lacepède, 1800) Fr, Br, M native  Cá thu song (Vietnamese), Cá thu trung-hoa (Vietnamese)  247 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 43281. 
Cyprinidae Semilabeo notabilis Peters, 1881 Fr, Thr native  Cá Anh vũ (Vietnamese)  44.00 cm TL male/unsexed  Known from northern Vietnam (Ref. 44416). Status of threat: Vulnerable (Ref. 46452). 
Cyprinidae Semilabeo obscurus Lin, 1981 Fr native   28.20 cm SL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Engraulidae Setipinna melanochir (Bleeker, 1849) Fr, Br, M native  Cá lep den (Vietnamese), Cá Lẹp vây đen (Vietnamese) common (usually seen) 33.00 cm SL male/unsexed  Found in the Mekong delta (Ref. 36625) and southern Vietnam (Ref. 9706). Also Ref. 36654, 43281. 
Gastromyzontidae Sewellia albisuera Freyhof, 2003 Fr native   6.40 cm SL male/unsexed  Found in the catchment of the River Thu Bon (Quang Nam Da Nang Province) whose estuary is located close to the city of Hoi An on the coast of Central Vietnam (Ref. 51729). 
Gastromyzontidae Sewellia analis Nguyen & Nguyen, 2005 Fr native      No picture yet.
Gastromyzontidae Sewellia breviventralis Freyhof & Serov, 2000 Fr native   5.07 cm SL male/unsexed  Type locality, River Pako, in the headwaters of the River Sesan, a tributary of the Se Kong, itself a tributary of the Mekong (Ref. 40433). 
Gastromyzontidae Sewellia elongata Roberts, 1998 Fr native   7.30 cm SL male/unsexed  Found in the upper Sekong (Ref. 40433).  No picture yet.
Gastromyzontidae Sewellia lineolata (Valenciennes, 1846) Fr native   5.66 cm SL male/unsexed  Found in Annam (Ref. 37838). Collected in the catchment of the River Huong (Perfume River, Thua Thien Hue Prov.), the River Thu Bon (Quang Nam Da Nang Prov.), the Rivers Trac Khu and Ve (Quang Ngai Prov.) and An Lao (Binh Dinh Prov.) and some streams along the coast of Central Vietnam (Ref. 40433). Also Ref. 12041, 12693, 38650, 26580. 
Gastromyzontidae Sewellia marmorata Serov, 1996 Fr native   5.89 cm SL male/unsexed  Found in Annam (Ref. 26580). Specimens collected in the catchment of the River Vinh Thanh, whose estuary is located in the city of Quy Nhon. Caught in riffles with current velocity exceeding 1 m/sec (Ref. 40433). 
Gastromyzontidae Sewellia medius Nguyen & Nguyen, 2005 Fr native    Found in Huê (Ref. 84796).  No picture yet.
Gastromyzontidae Sewellia patella Freyhof & Serov, 2000 Fr native   4.82 cm SL male/unsexed  Collected in the headwaters of the River Ba or Da Rang, which drains to the Vietnamese coast and enters the sea in Tuy Hoa, and in the headwaters of the River Sesan, a tributary of Se Kong, itself a tributary of the Mekong (Ref. 40433).  No picture yet.
Gastromyzontidae Sewellia pterolineata Roberts, 1998 Fr native   4.41 cm SL male/unsexed  Known from Trac Khuc River in Nghia Bin province (Ref. 38650); its estuary located in the city of Quang Ngai (Ref. 40433).  No picture yet.
Gastromyzontidae Sewellia songboensis Nguyen & Nguyen, 2005 Fr native    Found in Huê (Ref. 84796).  No picture yet.
Gastromyzontidae Sewellia speciosa Roberts, 1998 Fr native   5.37 cm SL male/unsexed  Known from the upper Sekong (Ref. 40433). 
Gastromyzontidae Sewellia trakhucensis Nguyen & Nguyen, 2005 Fr native    Found in Quang Ngai (Ref. 84796).  No picture yet.
Cyprinidae Sikukia stejnegeri Smith, 1931 Fr native   12.00 cm TL male/unsexed  Occurs in the Mekong basin. 
Odontobutidae Sineleotris chalmersi (Nichols & Pope, 1927) Fr native   15.00 cm TL male/unsexed  Known from northern Vietnam, but identity of all records needs checking (Ref. 44416). Present in Da River (Ref. 90167, 89724, 092840).  No picture yet.
Odontobutidae Sineleotris namxamensis Chen & Kottelat, 2004 Fr native   8.00 cm SL male/unsexed  Expected to occur in the country.  No picture yet.
Botiidae Sinibotia pulchra (Wu, 1939) Fr native   10.00 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Botiidae Sinibotia robusta (Wu, 1939) Fr native   18.00 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Xenocyprididae Sinibrama affinis (Vaillant, 1892) Fr native    Known from Lai Chau, northern Vietnam (Ref. 44416).  No picture yet.
Xenocyprididae Sinibrama melrosei (Nichols & Pope, 1927) Fr native   18.30 cm SL male/unsexed  Found in central and northern Viet Nam. Present in Da River (Ref. 90167, 89724). 
Cyprinidae Sinilabeo binhluensis Nguyen, 2001 Fr native    Type locality, Bình Lu, Phong Thô (Ref. 56787).  No picture yet.
Sinipercidae Siniperca chuatsi (Basilewsky, 1855) Fr native   70.00 cm TL male/unsexed  Found in Ba Be Lake (Ref. 46453). Present in Da River (Ref. 90167, 89724). 
Sinipercidae Siniperca knerii Garman, 1912 Fr native   35.50 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Sinipercidae Siniperca scherzeri Steindachner, 1892 Fr native   37.40 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Sinipercidae Siniperca vietnamensis Mai, 1978 Fr native    Found in northern Vietnam (Ref. 44416).  No picture yet.
Mastacembelidae Sinobdella sinensis (Bleeker, 1870) Fr native   21.10 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416).  No picture yet.
Balitoridae Sinogastromyzon chapaensis Mai, 1978 Fr native    Found in northern Vietnam (Ref. 44416). 
Balitoridae Sinogastromyzon daon Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Balitoridae Sinogastromyzon hagiangensis Nguyen, 2005 Fr native    Found in Hà Giang (Ref. 84796).  No picture yet.
Balitoridae Sinogastromyzon hexaocellum Nguyen, 2005 Fr native      No picture yet.
Balitoridae Sinogastromyzon hypercorpus Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Balitoridae Sinogastromyzon maon Nguyen & Nguyen, 2005 Fr native    Found in Son La (Ref. 84796).  No picture yet.
Balitoridae Sinogastromyzon minutus Mai, 1978 Fr native    Found in Red River system in Lai Chau (Ref. 37823). Also Ref. 44416.  No picture yet.
Balitoridae Sinogastromyzon multiocellum Nguyen, 2005 Fr native      No picture yet.
Balitoridae Sinogastromyzon namnaensis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Balitoridae Sinogastromyzon rugocauda Mai, 1978 Fr native    Known from Red River system in Son La (Ref. 37823). Present in Da River (Ref. 90167, 89724).  No picture yet.
Balitoridae Sinogastromyzon tonkinensis Pellegrin & Chevey, 1935 Fr, Thr native   3.80 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 37823. Status of threat: Rare (Ref. 46452).  No picture yet.
Cyprinidae Spinibarbus babeensis Nguyen, 2001 Fr native  Cá Sinh thân cao (Vietnamese)   Type locality, Hô Ba Bê, Bác Kan (Ref. 56787). Present in Dakrong River (Ref. 89722).  No picture yet.
Cyprinidae Spinibarbus brevicephalus Nguyen & Nguyen, 1997 Fr native    Found in Ha Tan, stream Vu Gia in Thu Bon drainage in Dai Loc district, Quang Nam-Da Nang Province (Ref. 94476).  No picture yet.
Cyprinidae Spinibarbus caldwelli (Nichols, 1925) Fr, Thr native  Cá Chày dất (Vietnamese)  32.50 cm SL male/unsexed  Found in northern Viet Nam (Ref. 44416). Known from the Ba Be Lake (Ref. 46453). Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). Also Ref. 43281. Status of threat: vulnerable (Ref. 46452). 
Cyprinidae Spinibarbus denticulatus (Oshima, 1926) Fr, Thr native  Cá Bỗng (Vietnamese)  41.50 cm SL male/unsexed  Known from northern Vietnam (Ref. 44416). Found in Ba Be Lake (Ref. 46453). Present in Da River (Ref. 90167, 89724). Also Ref. 43281. Status of threat: Vulnerable (Ref. 46452). 
Cyprinidae Spinibarbus maensis Nguyen, Duong & Tran, 2007 Fr native    Type locality, Ma River, Camthuy district, Thanh Province, Vietnam (Ref. 81932).  No picture yet.
Cyprinidae Spinibarbus nammauensis Nguyen & Nguyen, 2001 Fr native    Type locality, Hô Ba Bê, Nam Mâu, Ba Bê Bác Can (Ref. 56787).  No picture yet.
Cyprinidae Spinibarbus ovalius Nguyen & Ngo, 2001 Fr native    Type locality, Sông Gâm, Na Hang Tuyên Quang (Ref. 56787).  No picture yet.
Cyprinidae Spinibarbus vittatus Nguyen & Nguyen, 1997 Fr native    Known from Thac Bo, Da Bac, Da drainage in Hoa Binh Province (Ref. 94476).  No picture yet.
Gobionidae Squalidus argentatus (Sauvage & Dabry de Thiersant, 1874) Fr native   18.80 cm SL male/unsexed  Present in Dakrong River (Ref. 89722) and Da River (Ref. 90167, 89724). 
Gobionidae Squalidus atromaculatus (Nichols & Pope, 1927) Fr native   11.00 cm TL male/unsexed  Known from northern Vietnam: Nam Lung, Da River basin; Thanh Thuy, Lo River basin (Ref. 44416). Also Ref. 43281.  No picture yet.
Gobionidae Squalidus chankaensis Dybowski, 1872 Fr native   17.50 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Xenocyprididae Squaliobarbus curriculus (Richardson, 1846) Fr native  Cá Chày mắt đỏ (Vietnamese)  48.80 cm TL male/unsexed  Found in Hanoi, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Gobiidae Stenogobius mekongensis Watson, 1991 Fr native   6.91 cm SL male/unsexed ;6.84 cm SL female  Occurs in the Mekong River Delta region (Ref. 34009); including Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929).  No picture yet.
Gobiidae Stenogobius ophthalmoporus (Bleeker, 1853) Fr native   14.21 cm SL male/unsexed  Also Ref. 7050.  No picture yet.
Gobiidae Stigmatogobius pleurostigma (Bleeker, 1849) Fr native   6.40 cm SL male/unsexed 4.14 TL Known from the Mekong River (Ref. 56945). 
Botiidae Syncrossus beauforti (Smith, 1931) Fr native   25.00 cm SL male/unsexed  Occurs in the Mekong basin. Also Ref. 43281. 
Botiidae Syncrossus helodes (Sauvage, 1876) Fr native  Cá Heo sọc (Vietnamese)  30.00 cm SL male/unsexed  Known from the Mekong basin. Also Ref. 36654. 
Cyprinidae Systomus rubripinnis (Valenciennes, 1842) Fr native  Cá do mang (Vietnamese), Cá Đỏ mang (Vietnamese)  25.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 7050, 36654, 43281. 
Bagridae Tachysurus fulvidraco (Richardson, 1846) Fr native  Cá Bò (Vietnamese)  34.50 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 43281. 
Bagridae Tachysurus longispinalis (Nguyen, 2005) Fr native    Found in Lào Cai (Ref. 84796).  No picture yet.
Bagridae Tachysurus spilotus Ng, 2009 Fr native   6.93 cm SL male/unsexed   
Bagridae Tachysurus virgatus (Oshima, 1926) Fr native   13.30 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). 
Gobiidae Taenioides cirratus (Blyth, 1860) Fr native   30.00 cm TL male/unsexed  Reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Tetraodontidae Takifugu ocellatus (Linnaeus, 1758) Fr, Br, M native   17.60 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Tanichthyidae Tanichthys albonubes Lin, 1932 Fr native   4.00 cm TL male/unsexed  Found during the 1988 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). Commonly bred in captivity (Ref. 44416). 
Tanichthyidae Tanichthys kuehnei Bohlen, Dvorák, Thang & Slechtová, 2019 Fr native   3.06 cm SL male/unsexed  Type locality of Tanichthys kuehnei, stream Rach Hoi Da running from the Bach Ma Mountains into the Lang Co lagoon, Hue Province (Ref. 125920).  No picture yet.
Tanichthyidae Tanichthys micagemmae Freyhof & Herder, 2001 Fr native   2.31 cm SL male/unsexed  Type locality, stream Bau Dung, a tributary of River Ben Hai, Quang Binh Province (Ref. 41279). 
Tanichthyidae Tanichthys thacbaensis Nguyen & Ngo, 2001 Fr native    Type locality, Thác Bà, Yên Bình, Yên Bái (Ref. 56787).  No picture yet.
Dorosomatidae Tenualosa reevesii (Richardson, 1846) Fr, Br, M, Thr native  Cá Cháy thường (Vietnamese), Reeves shad (English) common (usually seen) 61.60 cm TL male/unsexed  Found in the Gulf of Tonkin (Ref. 9706) and Quang Ninh-Cat Ba (Ref. 58534). Status of threat: Vulnerable (Ref. 46452). Also Ref. 44416. 
Dorosomatidae Tenualosa thibaudeaui (Durand, 1940) Fr native  Cá Cháy nam (Vietnamese) scarce (very unlikely) 30.00 cm SL male/unsexed  Known from the Mekong Delta at Tien Giang and Tra Vinh Provinces and at Hong Ngu near the border with Cambodia. Occurs all year round at Go Cong Tay (Ref. 37770). 
Terapontidae Terapon jarbua (Fabricius, 1775) Fr, Br, M native  Cá Ong (Vietnamese), Jarbua terapon (English), Cá Căng cát (Vietnamese) common (usually seen) 36.00 cm TL male/unsexed  Known from the Gulf of tonkin and central Vietnam (Ref. 12846); also from Nha Trang and Spratly islands (Ref. 58534). Observed during a 1998 survey in Quang Ninh Province, northern Vietnam (Ref. 44416). Also Ref. 2682, 46893. 
Danionidae Thryssocypris tonlesapensis Roberts & Kottelat, 1984 Fr native   6.38 cm SL male/unsexed  Known from the Mekong River (Ref. 31464); reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). 
Cyprinidae Thynnichthys thynnoides (Bleeker, 1852) Fr native  Cá linh cám (Vietnamese)  25.00 cm TL male/unsexed  Found in the Mekong delta (Ref. 36625). Also Ref. 7050, 36654, 43281. 
Callionymidae Tonlesapia amnica Ng & Rainboth, 2011 Fr native  Mekong delta dragonet (English)  3.76 cm SL male/unsexed  Type locality, An Giang Province, Song Hau Giang (=Bassac River), 4 km downstream from Long Xuyen, UMMZ 246104 (holotype of Tonlesapia amnica, 3.76 cm SL). Occurs in the Mekong River delta in southern Vietnam (Ref. 87929). 
Cyprinidae Tor dongnaiensis Hoang, Pham, Durand, Tran & Phan, 2015 Fr native  Dongnai mahseer (English), Cá ngựa xám Đồng Nai (Vietnamese)  41.10 cm SL male/unsexed  Known from the middle Đồng Nai drainage (Ref. 104965) and the Upper Krong No (Ref. 123468),  No picture yet.
Cyprinidae Tor douronensis (Valenciennes, 1842) Fr native   35.00 cm TL male/unsexed   
Cyprinidae Tor sinensis Wu, 1977 Fr native   46.50 cm SL male/unsexed   
Cyprinidae Tor tambra (Valenciennes, 1842) Fr native  Mekong mahseer (English), Cá ngựa xám Mê Kông (Vietnamese)  100.00 cm TL male/unsexed  Occurs in Annam basin (Ref. 26580). Known from the upper Ea Krong No drainage, upper Mekong basin in montane evergreen forest in Bidoup-Núi Bà National Park, Lâm Ð?ng Province (Ref. 104965). 
Cyprinidae Tor tambroides (Bleeker, 1854) Fr, Thr native  Cá Ngựa xám (Vietnamese)  100.00 cm SL male/unsexed  Status of threat: Vulnerable (Ref. 46452). 
Xenocyprididae Toxabramis hotayensis Nguyen, 2001 Fr native    Type locality, Hô Tây, Hà Nôi (Ref. 56787).  No picture yet.
Xenocyprididae Toxabramis houdemeri Pellegrin, 1932 Fr native   14.80 cm SL male/unsexed  Found in Hong River basin, northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724). Also Ref. 33784.  No picture yet.
Xenocyprididae Toxabramis maensis Nguyen & Duong, 2006 Fr native      No picture yet.
Xenocyprididae Toxabramis nhatleensis Nguyen, Tran & Ta, 2006 Fr native      No picture yet.
Toxotidae Toxotes chatareus (Hamilton, 1822) Fr, Br native  Cá mang ro (Vietnamese)  40.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Refs. 36654, 43281. 
Nemacheilidae Traccatichthys bacmeensis (Nguyen & Vo, 2005) Fr native      No picture yet.
Nemacheilidae Traccatichthys pulcher (Nichols & Pope, 1927) Fr native   12.00 cm TL male/unsexed  Present in Da River (Ref. 90167, 89724). 
Nemacheilidae Traccatichthys taeniatus (Pellegrin & Chevey, 1936) Fr native   10.50 cm SL male/unsexed  Occurs in northern and central Viet Nam (Ref. 43281). Known from all coastal rivers north of River Ve (Quang Ngai Province); Ma River basin, and Red River basin (Ref. 40772). Also Ref. 43281, 44416.  No picture yet.
Osphronemidae Trichopodus microlepis (Günther, 1861) Fr native  Cá sac diep (Vietnamese)  14.00 cm TL male/unsexed  Occurs in the Mekong basin (Ref. 43281). Also Ref. 36654. 
Osphronemidae Trichopodus pectoralis Regan, 1910 Fr native  Cá sac ran (Vietnamese), Cá Sặc rằn (Vietnamese), Cá sat rang (Vietnamese)  25.00 cm TL male/unsexed  Naturally found in the Mekong basin (Ref. 43281). Also Ref. 36654. 
Osphronemidae Trichopodus trichopterus (Pallas, 1770) Fr native  Cá sac buòm (Vietnamese), Cá Sặc bươm (Vietnamese)  15.00 cm SL male/unsexed  Found in the Mekong basin (Ref. 36625). Also observed in January 2000 in Cua Lo, east of Vinh in northern Vietnam (Ref. 44416). Also Ref. 27732, 36654. 
Osphronemidae Trichopsis pumila (Arnold, 1936) Fr native   4.00 cm SL male/unsexed   
Osphronemidae Trichopsis vittata (Cuvier, 1831) Fr native  Cá bai tràu (Vietnamese)  8.00 cm TL male/unsexed  Found in Mekong delta. Also. Ref. 36654, 43281. 
Danionidae Trigonostigma espei (Meinken, 1967) Fr native   2.50 cm SL male/unsexed   
Soleidae Typhlachirus elongatus Pellegrin & Chevey, 1940 Fr, Br, Fi native   6.70 cm SL male/unsexed ;7.10 cm SL female  Known from estuarine zone of the Mekong, including the high estuarine tidal zone considerably upstream from the coastal province of Bac Lieu (Ref. 12693). Also reported from Song Hau Giang (a branch of the Mekong River also known as the Bassac River) (Ref. 87929). In range 12041.  No picture yet.
Dasyatidae Urogymnus polylepis (Bleeker, 1852) Fr native   240 cm WD male/unsexed  Occurs in the Mekong River. 
Gastromyzontidae Vanmanenia caobangensis Nguyen, 2005 Fr native    Found in Cao Bang (Ref. 84796).  No picture yet.
Gastromyzontidae Vanmanenia microlepis Nguyen, 2005 Fr native    Found in Lai Châu (Ref. 84796).  No picture yet.
Gastromyzontidae Vanmanenia monofasciodorsala Nguyen, 2005 Fr native    Found in Dien Bien (Ref. 84796).  No picture yet.
Gastromyzontidae Vanmanenia multiloba (Mai, 1978) Fr native    Found in northern Vietnam (Ref. 44416). Present in Da River (Ref. 90167, 89724).  No picture yet.
Gastromyzontidae Vanmanenia nahangensis Nguyen, 2005 Fr native    Found in Tuyên Quang (Ref. 84796).  No picture yet.
Gastromyzontidae Vanmanenia tetraloba (Mai, 1978) Fr native   9.96 cm SL male/unsexed  Found in northern Vietnam (Ref. 44416). Species identification needs verification (Ref. 44416).  No picture yet.
Gastromyzontidae Vanmanenia trifasciodorsala Nguyen, 2005 Fr native    Found in the Mekong River, Dien Bien (Ref. 84796).  No picture yet.
Gastromyzontidae Vanmanenia ventrosquamata (Mai, 1978) Fr native    Found in northern Vietnam (Ref. 44416). Species identification needs confirmation (Ref. 44416).  No picture yet.
Cyprinidae Vinagarra elongata Nguyen & Bui, 2010 Fr native   6.90 cm SL male/unsexed  Type locality of Vinagarra elongata, Tam Duong district in Lai Chau Province, northern Vietnam (Ref. 129011).  No picture yet.
Cyprinidae Vinagarra laichowensis (Nguyen & Doan, 1969) Fr native    Known from northern Vietnam (Ref. 44416). Type locality, Nam Mu stream, Phong Tho dist., Lai Chau Prov. (Ref. 46206).  No picture yet.
Cyprinidae Vinagarra tamduongensis Nguyen & Bui, 2010 Fr native   7.50 cm SL male/unsexed  Type locality of Vinagarra tamduongensis (Ref. 129011).  No picture yet.
Siluridae Wallago attu (Bloch & Schneider, 1801) Fr native  Cá leo (Vietnamese)  240 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). Reported to breed in the ricefields (Ref. 37770). Also Ref. 4833, 43281, 43640. 
Siluridae Wallago micropogon Ng, 2004 Fr native   154 cm SL male/unsexed  Known from the Mekong basin (Ref. 43281). Also Ref. 37770. 
Belonidae Xenentodon cancila (Hamilton, 1822) Fr native  Cá nhói (Vietnamese)  40.00 cm TL male/unsexed   
Belonidae Xenentodon canciloides (Bleeker, 1854) Fr native  Cá nhái (Vietnamese)  30.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). Also Ref. 43281. 
Xenocyprididae Xenocypris macrolepis Bleeker, 1871 Fr native   34.60 cm SL male/unsexed  Tonka (Ref. 1441). Present in Da River (Ref. 90167, 89724). 
Apogonidae Yarica hyalosoma (Bleeker, 1852) Fr native  scarce (very unlikely) 17.00 cm TL male/unsexed   
Botiidae Yasuhikotakia eos (Taki, 1972) Fr native  Cá heo (Vietnamese)  11.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
Botiidae Yasuhikotakia lecontei (Fowler, 1937) Fr native  Cá heo (Vietnamese)  15.00 cm SL male/unsexed  Found in Mekong delta (Ref. 36625). 
Botiidae Yasuhikotakia modesta (Bleeker, 1864) Fr native  Cá heo (Vietnamese), Cá Heo rứng (Vietnamese), Heo vạch (Vietnamese), Heo xanh (Vietnamese)  25.00 cm SL male/unsexed  Occurs in the Mekong basin (Ref. 27732). From May to July, this species migrates downstream from the Khone Falls apparently to flooplains in the Mekong delta. Juveniles around 2 cm appear from June to November at the Mekong delta (Ref. 37770). 
Nemacheilidae Yunnanilus cruciatus (Rendahl, 1944) Fr native   3.42 cm SL male/unsexed  Known from a small coastal stream at Thua Luu about 55 km south of Hue and from all rivers which drains to the Vietnamese coast and enters the sea between 14°30' and 18°00 N (Ref. 40772). Found in the coastal streams of Annam (Ref. 12041). Also Ref. 33690, 26580. 
Xenocyprididae Zacco platypus (Temminck & Schlegel, 1846) Fr native   22.50 cm TL male/unsexed  Found in northern Vietnam (Ref. 44416). 
Zenarchopteridae Zenarchopterus ectuntio (Hamilton, 1822) Fr native  Cá lìm kìm (Vietnamese)  18.00 cm TL male/unsexed  Found in Mekong delta (Ref. 36625). 
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