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Percichthyidae (striped bass, Macquarie perch; subclass Actinopterygii, order Perciformes) A large family of perch-like fish found in tropical and temperate waters. Some species are exclusively marine, others inhabit freshwater systems. One of the most popular and best studied species is Morone saxatilis (striped bass), 1 m, of the eastern USA, which undertakes annual migrations from the sea into the rivers to spawn. There are about 40 species.