Atlantic Salmon Identification Guide
How to recognize an Atlantic salmon by its spot pattern above the lateral line and largely unspotted tail.
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Key identification features
- Streamlined, silvery body with a narrow caudal peduncle and a moderately forked tail
- Small, X-shaped or round black spots scattered mostly above the lateral line and on the gill cover, with few or none below it
- Very few or no spots on the tail fin itself
- Small mouth that does not extend much past the eye
- Spawning adults darken to bronze, olive, or reddish tones; males develop a hooked lower jaw (kype)
Common look-alikes
- Brown trout: shows red or orange spots with pale halos in addition to black spots, and has a thicker caudal peduncle
- Steelhead/rainbow trout: shows a pink lateral stripe and spots covering the entire tail fin, unlike the Atlantic salmon's largely spot-free tail
- Landlocked salmon (same species): identical in appearance, distinguished mainly by never entering saltwater
Where you'll see one
Atlantic salmon are native to rivers draining into the North Atlantic, from eastern North America to Europe and Russia, spending one to several years at sea before returning to natal rivers to spawn.
Frequently asked questions
How do I tell an Atlantic salmon from a brown trout?
Check for red or orange spots - brown trout usually has them with pale halos, while Atlantic salmon shows only black spots, mainly above the lateral line.
What's the quickest way to separate Atlantic salmon from steelhead?
Look at the tail fin - steelhead has small black spots scattered across the whole tail, while Atlantic salmon's tail is largely unspotted.