Rainbow Trout Identification Guide
Identify rainbow trout by their pink lateral stripe and dense black spotting over an olive-silver body.
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Key identification features
- Broad pink to reddish stripe running along the midline from gill cover to tail
- Olive-green to steel-blue back fading to silvery sides and a white belly
- Dense small black spots scattered across the back, dorsal fin, adipose fin, and especially the tail fin
- Adipose fin present between the dorsal fin and tail
- Streamlined, moderately deep body typical of trout
Common look-alikes
- Steelhead: the sea-run form of the same species, but more uniformly silvery with a much fainter pink stripe
- Cutthroat trout: has a distinctive red-orange slash mark under the lower jaw that rainbow trout lack
- Brown trout: shows fewer, larger black and red-orange spots, each often ringed with a pale halo, and a more golden-brown overall tone
Where you'll see one
Rainbow trout are native to cold, clear rivers and lakes draining into the Pacific Ocean in western North America and eastern Russia. They have been widely stocked into cool freshwater streams, rivers, and lakes across the globe, favoring well-oxygenated water with gravel or rocky bottoms.
Frequently asked questions
How do I tell a rainbow trout from a cutthroat trout?
Look under the lower jaw: cutthroat trout have a bright red-orange slash there, which rainbow trout lack. Rainbow trout instead show a pink lateral stripe along the body.
What separates rainbow trout from brown trout at a glance?
Rainbow trout have many small, dense black spots and a pink stripe, while brown trout have fewer, larger spots (some reddish) that are often surrounded by a pale ring.