Lahontan cutthroat trout

The Lahontan cutthroat trout (Oncorhynchus henshawi, formerly treated as a subspecies of Oncorhynchus clarkii) is a fish of the family Salmonidae native to cold-water tributaries of the Basin and Range province of Nevada and adjoining parts of southeast Oregon and northeastern California. It belongs to the Pacific trout group of the genus Oncorhynchus, and in 2023 the American Fisheries Society recognised it as one of four distinct cutthroat trout species. It is named for the red slash under the lower jaw. Populations live as small stream fish or as very large lake fish, and the Pyramid Lake form produced the largest cutthroat trout on record, a fish of 18.6 kilograms. The species feeds on aquatic and terrestrial insects, crayfish, molluscs and other fish. Overfishing, dams, logging, introduced trout, disease and climate change have eliminated it from Lake Tahoe and Pyramid Lake and left upstream populations isolated; it was important to the Paiute and Washoe peoples and is a popular gamefish.