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They can be divided into 3 distinct groups; Bony fish (with bone skeletons), Cartilaginous fish (with cartilage skeletons) and Jawless fish (a link to prehistoric times, with no true backbone). The former has about 20,000 species, and includes most of those found on your fishmongers slab; the cartilaginous variety includes sharks, and similar specimens - which generally have their mouth on their lower jaw (there are fewer than 600 varieties); the latter includes a handful, such as lampries and other sucking fish. See individual varieties; 'Fish and Health'
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