 There are also lacustrine and riverine populations that spend their entire lives in freshwater.One such population is the trout of Lake Crescent in Washington state that was formerly considered to be a separate subspecies called the Lake Crescent cutthroat trout, "Oncorhynchus clarkii crescenti".Cutthroat trout were given the name "Salmo clarkii" in honor of William Clark, who co-led the expedition of 1804–1806.