Bull Trout Identification Guide

Key identification features

• Elongated, torpedo-shaped body typical of large stream-dwelling char
• Olive-green to gray-brown back marked with small pale yellow to pink or orange spots
• No black spots anywhere on the body, a key difference from many true trout
• Large, distinctly flattened head compared to other salmonids
• White or cream-colored leading edge on the lower fins, including the pelvic, anal, and pectoral fins
• Tail ranges from slightly forked to nearly square

Common look-alikes

• Dolly Varden: nearly identical in appearance, distinguished mainly by range since the two species rarely overlap, along with subtle skull and genetic differences rather than obvious field marks
• Brook trout: shows distinctive wavy, worm-like vermiculated markings on the back and blue-haloed red spots, both of which bull trout lack entirely

Where you'll see one

Bull trout require some of the coldest, cleanest water of any freshwater fish, inhabiting rivers, streams, and lakes of the Pacific Northwest and northern Rocky Mountains. Many populations are migratory, moving between small, cold spawning tributaries and larger river or lake habitat where they grow to substantial size as adults.