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Wikipedia: Lahontan Cutthroat Trout

Lahontan cutthroat trout (Oncorhynchus clarki henshawi) is the largest cutthroat trout subspecies, and the state fish of Nevada. It is native to the drainages of the Truckee River, Humboldt River, Carson River, Walker River, Quinn River and several smaller rivers in the Great Basin of North America. Irrigation developments along these rivers have severely disrupted its habitat. It was classified as an endangered species between 1970 and 1975, and is currently listed as a threatened species.