Dodatak:Popis ribljih vrsta, Ol
Rod Oligancistrus
uredi- Oligancistrus punctatissimus (Steindachner, 1881)
Actinopterygii > Siluriformes > Loricariidae
Rod Oligobrycon
uredi- Oligobrycon microstomus Eigenmann, 1915
Actinopterygii > Characiformes > Characidae
Rod Oligocottus
uredi- Oligocottus latifrons (Gilbert & Thompson, 1905)
- Oligocottus maculosus Girard, 1856
- Oligocottus rimensis (Greeley, 1899)
- Oligocottus rubellio (Greeley, 1899)
- Oligocottus snyderi Greeley, 1898
Actinopterygii > Scorpaeniformes > Cottidae →Cottidae →Scorpaeniformes
Rod Oligolepis
uredi- Oligolepis acutipennis (Valenciennes, 1837)
- Oligolepis cylindriceps (Hora, 1923)
- Oligolepis dasi (Talwar, Chatterjee & Dev Roy, 1982)
- Oligolepis jaarmani (Weber, 1913)
- Oligolepis keiensis (Smith, 1938)
- Oligolepis stomias (Smith, 1941)
Actinopterygii → Perciformes → Gobiidae
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Oligolepis acutipennis -
Oligolepis cylindriceps
†Porodica Oligopleuridae
uredi- †Oeonoscopus Costa 1864
- †Oligopleurus Thiollière 1850
- †Spathiurus
Pisces → Actinopterygii → Isospondyli
Rod Oligoplites
uredi- Oligoplites altus (Günther, 1868)
- Oligoplites palometa (Cuvier, 1832)
- Oligoplites refulgens Gilbert & Starks, 1904
- Oligoplites saliens (Bloch, 1793)
- Oligoplites saurus (Bloch & Schneider, 1801)
Actinopterygii > Perciformes > Carangidae
- Oligosarcus acutirostris Menezes, 1987
- Oligosarcus argenteus Günther, 1864
- Oligosarcus bolivianus (Fowler, 1940)
- Oligosarcus brevioris Menezes, 1987
- Oligosarcus hepsetus (Cuvier, 1829)
- Oligosarcus itau Mirande, Aguilera & Azpelicueta, 2011
- Oligosarcus jacuiensis Menezes & Ribeiro, 2010
- Oligosarcus jenynsii (Günther, 1864)
- Oligosarcus longirostris Menezes & Géry, 1983
- Oligosarcus macrolepis (Steindachner, 1877)
- Oligosarcus menezesi Miquelarena & Protogino, 1996
- Oligosarcus oligolepis (Steindachner, 1867)
- Oligosarcus paranensis Menezes & Géry, 1983
- Oligosarcus perdido Ribeiro, Cavallaro & Froehlich, 2007
- Oligosarcus pintoi Amaral Campos, 1945
- Oligosarcus planaltinae Menezes & Géry, 1983
- Oligosarcus robustus Menezes, 1969
- Oligosarcus schindleri Menezes & Géry, 1983
- Oligosarcus solitarius Menezes, 1987
Animalia → Chordata → Actinopterygii → Characiformes → Characidae
- Oliotius oligolepis (Bleeker, 1853)
Pisces → Actinopterygii → Cypriniformes → Cyprinidae
- Olisthops cyanomelas Richardson, 1850
Actinopterygii > Perciformes > Odacidae
Rod Olivaichthys
uredi- Olivaichthys cuyanus (Ringuelet, 1965)
- Olivaichthys mesembrinus (Ringuelet, 1982)
- Olivaichthys viedmensis (MacDonagh, 1931)
Actinopterygii > Siluriformes > Diplomystidae
Rod Oloplotosus
uredi- Oloplotosus luteus Gomon & Roberts, 1978
- Oloplotosus mariae Weber, 1913
- Oloplotosus torobo Allen, 1985
Actinopterygii > Siluriformes > Plotosidae
- Olyra burmanica Day, 1872
- Olyra collettii (Steindachner, 1881)
- Olyra horae (Prashad & Mukerji, 1929)
- Olyra kempi Chaudhuri, 1912
- Olyra longicaudata McClelland, 1842
Actinopterygii > Siluriformes > Olyridae
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Olyra longicaudata
- Olyra burmanica Day, 1872
- Olyra collettii (Steindachner, 1881)
- Olyra horae (Prashad & Mukerji, 1929)
- Olyra kempi Chaudhuri, 1912
- Olyra longicaudata McClelland, 1842