Salvelinus fontinalis, commonly known as the brook trout, is a freshwater fish native to eastern North America. It thrives in cold, clear, and oxygen-rich streams and lakes. Distinguished by its marbled pattern of lighter spots and worm-like markings on a dark green body, it exhibits vivid red spots encircled by blue. The species is prized for its beauty and adaptability, making it a popular game fish.

Salvelinus fontinalis, commonly known as the brook trout, is native to North America. Its geographical distribution includes the northeastern United States and eastern Canada, particularly in the Appalachian region, the Great Lakes region, and parts of eastern Canada, such as Nova Scotia, Quebec, and Newfoundland.

Brook trout typically inhabit clear, cold, well-oxygenated streams, rivers, and lakes. They prefer environments with temperatures ranging between 34°F and 72°F (1°C to 22°C). These aquatic ecosystems often have gravel or rocky substrates and are surrounded by forested areas that provide shade and help maintain cooler water temperatures.

As a cold-water species, brook trout are often found in headwaters and small stream systems where they play a crucial role as both predator and prey. They feed on a variety of aquatic and terrestrial invertebrates, and in turn, serve as prey for larger fish, birds, and mammals. Their presence is an indicator of healthy, clean water systems.