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Which freshwater fish occurs farther north than any other freshwater fish?
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protacanthopterygian
Rainbow trout (Oncorhynchus mykiss).
The Arctic char (Salvelinus alpinus) is the most northerly occurring of any freshwater fish. A member of the family Salmonidae, this species inhabits the cold waters of the Northern Hemisphere, including regions in North America and Europe, and is known to enter rivers and lakes to breed.12