Fish inhabiting the streams of the Smokies include trout, lamprey, darter, shiner, bass, and sucker. The brook trout is the only trout species native to the range, although northwestern rainbow trout and European brown trout were introduced in the first half of the 20th century. The larger rainbow and brown trout outcompete the native brook trout for food and habitat at lower elevations. As such, most of the brook trout found in the park today are in streams above 3,000 feet in elevation. Trout in the Smokies are generally smaller than other members of their species in different locales. Protected fish species in the range include the smoky and yellowfin madtom, the spotfin chub, and the duskytail darter.