Trouts are usually freshwater species but all Salmo and Oncorhynchus species have both freshwater and sea-run populations. The Pacific trouts and the genus Salmo can be distinguished from other salmonids by black spots on the head and body and 7-12 anal fin rays. namaycush ), brook or speckled trout ( S. Several chars of the genus Salvelinus are also commonly called trout, including lake trout ( S. These 3 species all originated in Pacific drainages. clarki respectively) along with Pacific salmon. Rainbow and cutthroat trouts are placed in the genus Oncorhynchus (O. Trouts include the brown trout ( Salmo trutta ) and Atlantic salmon ( S. Trout is the common name given to the species of freshwater fish from 3 genera, all members of the salmon family (Salmonidae).
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