A-Z of Fishes - Basic information about many species of fresh, salt, and brackish-water fish, grouped by family and listed by common name, as well as a message board devoted to the novice aquarist..
Class Actinopterygii - Taxonomy of the class known as bony fish, osteichthyes, ray-finned fish, or spiny-rayed fish, with profiles of representative species of each order and family..
FishBase - Searchable global database containing information on 25,585 species (110,000 common names), 71,000 synonyms, 28,000 photos, and 21,000 references..
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