Brook trout are a species of freshwater fish native to North America. They are known for their vibrant colors, featuring a dark green or blue back with a marbled pattern and bright red spots. These fish typically inhabit cold, clear streams and lakes, preferring well-oxygenated waters. Brook trout are often found in mountainous regions and are popular among anglers for their fighting ability and taste. They can grow up to 12 to 20 inches long, although some individuals may reach larger sizes. Conservation efforts are important for maintaining their habitats, especially in areas affected by pollution and climate change.