Brook trout are native to the waters of eastern and upper midwestern United States and Canada, and have been introduced by people elsewhere. They like to live in clean, clear, spring-fed streams with many pools and riffles. There they hide under large rocks, in deep pools and near banks with overhanging trees and plants. Brook trout feed on many water and land insects, crustaceans, fish and even some aquatic mammals, such as voles. Some brook trout are anadromous, which means they live part of time in fresh water and part of the time in salt water—these kind brook trout are called salters. You can tell you’re looking at a brook trout by the olive-green or dark brown color of its back that lightens to white or orange on its belly. Brook trout have spots on their sides that are pale yellow, greenish, or red with blue rings. You will also see bright white leading edges on their lower fins.