Covers over 25,000 species of fish and has over 70,000 synonyms and 180,000 common names in over 200 languages. Over 35,000 pictures illustrate these fish. Information about them has been extracted from 20,000 references. The classification of higher taxa follows the version of Eschmeyer's Catalog of Fishes . Data includes family, order, class, environment, climate, importance, resilience, distribution, biology, ecology, diet, reproduction, and references.