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 25585 species (110000 common names) 71000 synonyms 28000 photos and 21000 references.