Salvelinus fontinalis, commonly known as the brook trout, is a freshwater fish native to North America. It typically inhabits cold, clear streams, rivers, and lakes, preferring areas with abundant vegetation and clean gravel beds for spawning. The brook trout is recognized for its vibrant coloration, featuring a dark green or blue back, a white-edged dorsal fin, and red spots on its sides. This species can grow up to 30 inches in length and weigh over 10 pounds, although most individuals are smaller. Salvelinus fontinalis is an important species for both ecological balance and recreational fishing, often sought after by anglers for its fighting ability and taste.