- ACANTHURIDAE
- ACIPENSERIDAE
- ACROPOMATIDAE
- AGONIDAE
- ALBULIDAE
- ALEPISAURIDAE
- ALEPOCEPHALIDAE
- AMBLYOPSIDAE
- AMIIDAE
- AMMODYTIDAE
- ANABANTIDAE
- ANABLEPIDAE
- ANARHICHADIDAE
- ANGUILLIDAE
- ANGUILLIFORMES
- ANOMALOPIDAE
- ANOPLOGASTRIDAE
- ANOPLOPOMATIDAE
- ANOTOPTERIDAE
- ANTENNARIIDAE
- APHREDODERIDAE
- APLOACTINIDAE
- APOGONIDAE
- APOLECTIDAE
- ARGENTINIDAE
- ARIIDAE
- ASTRONESTHIDAE
- ATHERINIDAE
- AULORHYNCHIDAE
- AULOSTOMIDAE
