Brook Trout vs. brown trout: how to tell them apart
A char versus a true trout: vermiculation and white-edged fins versus red halos and a square tail.
Fast comparison
| Feature | Brook Trout | Brown Trout |
|---|---|---|
| Back pattern | Worm-like pale vermiculation lines | Plain or with dark spots; no worm lines |
| Flank spots | Pale yellow spots; red spots with blue halos | Red-black spots, many ringed with pale halos |
| Fins | White leading edges with black striping | Plain fins, no white-black edge |
| Tail | Nearly square | Slightly forked |
Photograph these features
- Back from above for vermiculation
- Pectoral or pelvic fin edge close-up
- Flank in even light for halo pattern
- Tail spread for the square-versus-forked check
When it is not clear-cut
Brook trout are char (Salvelinus), browns are true salmonids — evolution explains the look. Tiger trout (brook × brown) show dramatic maze vermiculation where stocked.
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.
Upload a fish photoBrowse speciesBrook Trout species guide
Full profile: habitat, baits, seasons and range.
Brown Trout species guide
Full profile: habitat, baits, seasons and range.
Frequently asked questions
- Is a brook trout really a trout?
- Technically a char — same family, different genus. Anglers still call it a trout.
- Which is more cold-water demanding?
- Brook trout need the coldest, cleanest water of the two.
- What is a tiger trout?
- The striking sterile hybrid of the two, stocked in some states for trophy fishing.