The brook trout (Salvelinus fontinalis) was officially adopted as the State Fish of West Virginia by the Legislature during the 1973 Regular Session with the approval of House Concurrent Resolution No. 6. This native fish is perhaps the most-sought-after trout by anglers, as it puts up an excellent fight for its size. It thrives in small, cold, spring-fed streams and is unable to withstand warmer temperatures. The brook trout is olive with lighter sides and a reddish belly (in males) and is easily identified by the light-colored edges of the lower fins. Its hatchery growth averages six to eight inches in length soon after birth.