The upper Carson River watershed provides habitat for the threatened Lahontan cutthroat trout ("Oncorhynchus clarki henshawi"), as well as large non-native rainbow trout ("Oncorhynchus mykiss") and brown trout ("Salmo trutta"), providing excellent fly fishing. The Lahontan cutthroat is threatened by hybridization with rainbow trout, but there is a pure Lahontan strain on of the East Fork Carson River from the headwaters to Carson Falls. There is also a native population of the only Paiute cutthroat trout ("Oncorhynchus clarki seleniris") in existence in the drainages of Silver King Creek, a tributary of the East Fork Carson River in the Carson Ranger District of the Humboldt-Toiyabe National Forest.