Rod Occella 4 vrste
- Occella dodecaedron (Tilesius, 1813)
- Occella iburia (Jordan & Starks, 1904)
- Occella kasawae (Jordan & Hubbs, 1925)
- Occella kuronumai (Freeman, 1951)
Rod Occidentarius
- Occidentarius platypogon (Günther, 1864)
- Osteogeneiosus militaris (Linnaeus, 1758)
Actinopterygii > Siluriformes > Ariidae
Rod Ochetobius Günther, 1868
- Ochetobius elongatus (Kner, 1867)
Pisces → Actinopterygii → Cypriniformes → Cyprinidae
Rod Ochmacanthus
- Ochmacanthus alternus Myers, 1927
- Ochmacanthus batrachostomus (Miranda Ribeiro, 1912)
- Ochmacanthus flabelliferus Eigenmann, 1912
- Ochmacanthus orinoco Myers, 1927
- Ochmacanthus reinhardtii (Steindachner, 1882)
Actinopterygii > Siluriformes > Trichomycteridae
Rod Ocosia
- Ocosia apia Poss & Eschmeyer, 1975
- Ocosia fasciata Matsubara, 1943
- Ocosia possi Mandrytsa & Usachev, 1990
- Ocosia ramaraoi Poss & Eschmeyer, 1975
- Ocosia spinosa Chen, 1981
- Ocosia vespa Jordan & Starks, 1904
- Ocosia zaspilota Poss & Eschmeyer, 1975
Actinopterygii → Scorpaeniformes → Tetrarogidae
Rod Ocynectes
- Ocynectes maschalis Jordan & Starks, 1904
- Ocynectes modestus Snyder, 1911
Actinopterygii > Scorpaeniformes > Cottidae
Rod Ocyurus
- Ocyurus chrysurus (Bloch, 1791)
Actinopterygii > Perciformes > Lutjanidae