Salvelinus confluentus, commonly known as the bull trout, is a freshwater fish native to the cold, clear streams and rivers of the Pacific Northwest. It is known for its olive-green body with pale yellowish spots and a white leading edge on its fins. Bull trout prefer pristine habitats and are sensitive to environmental changes, playing a crucial role as indicators of ecosystem health.

Salvelinus confluentus, commonly known as the bull trout, is native to North America. Its geographical distribution includes the northwestern United States and western Canada. Specifically, it is found in the Pacific Northwest region, including the states of Washington, Oregon, Idaho, and Montana, as well as the Canadian provinces of British Columbia and Alberta.

Bull trout typically inhabit cold, clear, and clean freshwater environments. They are often found in river and stream systems with stable channels and complex structure, such as large woody debris and pools. These habitats are characterized by low temperatures, often below 15°C (59°F), and high oxygen levels. Bull trout are also found in large, deep lakes where they can dive to cold, deep waters, especially during warmer months.

As apex predators in their aquatic ecosystems, bull trout play a crucial role in maintaining the balance of species within their environments. They primarily feed on smaller fish, but their diet can also include aquatic insects and crustaceans. Due to their need for cold water, they are considered an indicator species for healthy, unpolluted habitats. Regional adaptations may include variations in size and migratory patterns, with some populations being resident and others migratory.