Lake Trout vs. bull trout: how to tell them apart

Two deep-water chars. Tail shape and fin edges separate them; range confirms.

Fast comparison

FeatureLake TroutBull Trout
TailDeeply forkedFlat to slightly curved rear edge
Fin edgesNo white leading-edge marksWhite leading edges, front fins
SpottingLight wormy spots over dark green-grayOrange to red spots over olive-back
Where foundDeep cold lakes across the NorthCold rivers/lakes of the Pacific Northwest

Photograph these features

  1. Tail spread flat for the fork check
  2. Leading edge of a pectoral fin
  3. Flank spots in even light
  4. Location — outside the Northwest, bull trout are unlikely

When it is not clear-cut

Bull trout are protected in much of their range — know the local rules before harvesting. Lake trout live deeper; bull trout often patrol current seams.

Identification tools can be wrong. Confirm uncertain fish with the local fisheries authority before relying on the result for harvest or possession rules.

Compare your catch

Use an AI-assisted suggestion as a starting point, then check the features above yourself.

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Frequently asked questions

Are bull trout actually trout?
They are char, like lake trout and brook trout.
Which gets bigger?
Lake trout — century-class fish exist in Great Lakes and northern lakes.
Why the protection rules?
Bull trout declined across much of their range; many waters require immediate release.

Authoritative references

Salvelinus namaycush — Wikipedia
Salvelinus confluentus — Wikipedia