Cutthroat Trout and Similar Species
Oncorhynchus lewisi
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Open the appSeveral fish can be confused with Cutthroat Trout. Here are the key differences.
Species often confused with {name}
Rainbow Trout
Oncorhynchus mykiss
Key differences: Rainbow Trout generally lack the red 'slash' marks under the jaw (though some hybrids may show faint coloration). Their spots are typically more evenly distributed over the body and often larger. Rainbow Trout usually have a distinct pink or red lateral stripe, which is less common or absent in pure Cutthroat Trout. Basibranchial teeth are present in both, but the jaw slashes are the primary external differentiator.
Brown Trout
Salmo trutta
Key differences: Brown Trout have distinct dark spots (often with pale halos) and frequently red or orange spots on their sides. They lack the red jaw slashes and basibranchial teeth. Their caudal fin is typically less forked than that of Cutthroat Trout.
Brook Trout
Salvelinus fontinalis
Key differences: Brook Trout are char, not true trout. They have light spots (red with blue halos) on a dark background, vermiculations (worm-like markings) on their back and dorsal fin, and white leading edges on their lower fins. They lack jaw slashes and basibranchial teeth.
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