Steelhead Identification Guide
How to recognize a steelhead by its fully spotted tail fin, pink lateral stripe, and silvery sheen.
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Key identification features
- Anadromous (sea-run) form of rainbow trout, with a steel-blue to silvery body fresh from the ocean
- Small black spots scattered over the back, sides, dorsal fin, and entire tail fin, including both lobes
- Pink to reddish lateral stripe, often faint at sea but becoming vivid once the fish enters fresh water
- Squarer, less deeply forked tail than most Pacific salmon
- Larger average size than resident rainbow trout, often with a more silvery, less colorful sheen when fresh-run
Common look-alikes
- Coho salmon: has spots only on the upper tail lobe and white gums, unlike steelhead's fully spotted tail
- Atlantic salmon: shows fewer or no spots on the tail fin, versus steelhead's spot-covered tail and dorsal fin
- Resident rainbow trout: same species, but steelhead is typically larger, more silvery, and less colorfully marked when fresh from the sea
Where you'll see one
Steelhead range throughout the North Pacific, spawning in rivers from California and the Pacific Northwest through British Columbia and Alaska to the Russian Far East, migrating to the ocean before returning to fresh water to spawn.
Frequently asked questions
How do I tell steelhead from coho salmon?
Look at the tail fin - steelhead has small spots across the entire tail, while coho shows spots only on the upper lobe.
How can I recognize steelhead versus Atlantic salmon?
Steelhead's tail and dorsal fin are covered in small black spots, while Atlantic salmon shows few or no spots on the tail at all.