-
Chiasmodontidae
Family, Bony fish (Actinopterygii), Marine
-
Chimaeridae – Rabbitfishes
Family, Cartilagenous fish (Chondrichthyes), Marine
-
Chlamydoselachidae – Frilled sharks
Family, Cartilagenous fish (Chondrichthyes), Marine
-
Cichlidae
Family, Bony fish (Actinopterygii), Terrestrial
-
Clupeidae
Family, Bony fish (Actinopterygii), Marine, terrestrial
-
Cobitidae
Family, Bony fish (Actinopterygii), Terrestrial
-
Congridae – Conger eels
Family, Bony fish (Actinopterygii), Marine
-
Cottidae
Family, Bony fish (Actinopterygii), Marine, terrestrial
-
Cyclopteridae
Family, Bony fish (Actinopterygii), Marine
-
Cynoglossidae
Family, Bony fish (Actinopterygii), Marine
-
Cyprinidae
Family, Bony fish (Actinopterygii), Marine, terrestrial
-
Cyprinodontidae
Family, Bony fish (Actinopterygii), Terrestrial
-
Dactylopteridae
Family, Bony fish (Actinopterygii), Marine
-
Dalatiidae
Family, Cartilagenous fish (Chondrichthyes), Marine
-
Dasyatidae
Family, Cartilagenous fish (Chondrichthyes), Marine
-
Derichthyidae – Longneck eels
Family, Bony fish (Actinopterygii), Marine
-
Diretmidae – Spinyfins
Family, Bony fish (Actinopterygii), Marine
-
Echeneidae
Family, Bony fish (Actinopterygii), Marine
-
Echinorhinidae – Bramble sharks
Family, Cartilagenous fish (Chondrichthyes), Marine
-
Engraulidae
Family, Bony fish (Actinopterygii), Marine