• Abantennarius nummifer (Cuvier, 1817)
• Ablennes hians (Valenciennes, 1846)
• Abramis ballerus (Linnaeus, 1758) accepted as Ballerus ballerus (Linnaeus, 1758)
• Abramis bjoerkna (Linnaeus, 1758) accepted as Blicca bjoerkna (Linnaeus, 1758)
• Abramis brama (Linnaeus, 1758)
• Abramis sapa (Pallas, 1814) accepted as Ballerus sapa (Pallas, 1814)
• Abudefduf luridus (Cuvier, 1830) accepted as Similiparma lurida (Cuvier, 1830)
• Abudefduf saxatilis (Linnaeus, 1758)
• Abudefduf sexfasciatus (Lacepède, 1801)
• Abudefduf vaigiensis (Quoy & Gaimard, 1825)
• Acanthochaenus luetkenii Gill, 1884
• Acanthocybium solandri (Cuvier, 1832)
• Acantholabrus palloni (Risso, 1810)
• Acanthonus armatus Günther, 1878
• Acanthostracion notacanthus (Bleeker, 1863)
• Acanthostracion polygonium Poey, 1876
• Acanthostracion polygonius Poey, 1876 accepted as Acanthostracion polygonium Poey, 1876
• Acanthostracion quadricornis (Linnaeus, 1758)
• Acanthurus bahianus Castelnau, 1855
• Acanthurus chirurgus (Bloch, 1787)
• Acanthurus coeruleus Bloch & Schneider, 1801
• Acanthurus lineatus (Linnaeus, 1758)
• Acanthurus monroviae Steindachner, 1876
• Acentronura dendritica (Barbour, 1905) accepted as Amphelikturus dendriticus (Barbour, 1905)
• Acipenser baerii Brandt, 1869 accepted as Huso baerii (Brandt, 1869)
• Acipenser baerii baerii Brandt, 1869 accepted as Acipenser baerii Brandt, 1869 accepted as Huso baerii (Brandt, 1869)
• Acipenser brevirostrum Lesueur, 1818 accepted as Huso brevirostrum (Lesueur, 1818)
• Acipenser gueldenstaedti Brandt & Ratzeberg, 1833 accepted as Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833 accepted as Huso gueldenstaedtii (Brandt & Ratzeburg, 1833)
• Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833 accepted as Huso gueldenstaedtii (Brandt & Ratzeburg, 1833)
• Acipenser naccarii Bonaparte, 1836 accepted as Huso naccarii (Bonaparte, 1836)
• Acipenser nudiventris Lovetsky, 1828 accepted as Huso nudiventris (Lovetsky, 1828)
• Acipenser oxyrhynchus Mitchill, 1814 accepted as Acipenser oxyrinchus Mitchill, 1815
• Acipenser oxyrinchus Mitchill, 1815
• Acipenser persicus Borodin, 1897 accepted as Huso persicus (Borodin, 1897)
• Acipenser ruthenus Linnaeus, 1758 accepted as Huso ruthenus (Linnaeus, 1758)
• Acipenser stellatus Pallas, 1771 accepted as Huso stellatus (Pallas, 1771)
• Acipenser sturio Linnaeus, 1758
• Acromycter perturbator (Parr, 1932)
• Agonostomus monticola (Bancroft, 1834) accepted as Dajaus monticola (Bancroft, 1834)
• Agonus cataphractus (Linnaeus, 1758)
• Ahlia egmontis (Jordan, 1884)
• Ahliesaurus berryi Bertelsen, Krefft & Marshall, 1976
• Aidablennius sphynx (Valenciennes, 1836)
• Albula vulpes (Linnaeus, 1758)
• Alburnoides bipunctatus (Bloch, 1782)
• Alburnus alburnus (Linnaeus, 1758)
• Alburnus sarmaticus Freyhof & Kottelat, 2007
• Aldrovandia affinis (Günther, 1877)
• Aldrovandia gracilis Goode & Bean, 1896
• Aldrovandia oleosa Sulak, 1977
• Aldrovandia phalacra (Vaillant, 1888)
• Alectis alexandrina (Geoffroy Saint-Hilaire, 1817)
• Alectis alexandrinus (Geoffroy Saint-Hilaire, 1817) accepted as Alectis alexandrina (Geoffroy Saint-Hilaire, 1817)
• Alectis ciliaris (Bloch, 1787)
• Alepes djedaba (Forsskål, 1775)
• Alepisaurus brevirostris Gibbs, 1960
• Alepisaurus ferox Lowe, 1833
• Alepocephalus agassizii Goode & Bean, 1883
• Alepocephalus australis Barnard, 1923
• Alepocephalus bairdii Goode & Bean, 1879
• Alepocephalus productus Gill, 1883
• Alepocephalus rostratus Risso, 1820
• Allocyttus verrucosus (Gilchrist, 1906)
• Alosa aestivalis (Mitchill, 1814)
• Alosa alosa (Linnaeus, 1758)
• Alosa caspia (Eichwald, 1838)
• Alosa caspia caspia (Eichwald, 1838) accepted as Alosa caspia (Eichwald, 1838)
• Alosa fallax (Lacepède, 1803)
• Alosa immaculata Bennett, 1835
• Alosa maeotica (Grimm, 1901)
• Alosa mediocris (Mitchill, 1814)
• Alosa pontica (Eichwald, 1838) accepted as Alosa immaculata Bennett, 1835
• Alosa pseudoharengus (Wilson, 1811)
• Alosa sapidissima (Wilson, 1811)
• Alosa tanaica (Grimm, 1901)
• Aluterus heudelotii Hollard, 1855
• Aluterus monoceros (Linnaeus, 1758)
• Aluterus schoepfii (Walbaum, 1792)
• Aluterus scriptus (Osbeck, 1765)
• Ameiurus melas (Rafinesque, 1820)
• Amia calva Linnaeus, 1766
• Ammodytes americanus DeKay, 1842
• Ammodytes dubius Reinhardt, 1837
• Ammodytes lancea Cuvier, 1829 accepted as Ammodytes tobianus Linnaeus, 1758
• Ammodytes lanceolatus Le Sauvage, 1824 accepted as Hyperoplus lanceolatus (Le Sauvage, 1824)
• Ammodytes marinus Raitt, 1934
• Ammodytes tobianus Linnaeus, 1758
• Amphelikturus dendriticus (Barbour, 1905)
• Anarchias euryurus (Lea, 1913)
• Anarchias similis (Lea, 1913)
• Anarhichas denticulatus Krøyer, 1845
• Anarhichas lupus Linnaeus, 1758
• Anarhichas minor Olafsen, 1772
• Anchoa hepsetus (Linnaeus, 1758)
• Anchoa mitchilli (Valenciennes, 1848)
• Anchoviella perfasciata (Poey, 1860)
• Ancylopsetta ommata (Jordan & Gilbert, 1883) accepted as Ancylopsetta quadrocellata Gill, 1864
• Ancylopsetta quadrocellata Gill, 1864
• Anguilla anguilla (Linnaeus, 1758)
• Anguilla rostrata (Lesueur, 1817)