Colorado River Cutthroat Trout and Similar Species
Oncorhynchus clarkii pleuriticus
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Open the appSeveral fish can be confused with Colorado River Cutthroat Trout. Here are the key differences.
Species often confused with {name}
Rainbow Trout
Oncorhynchus mykiss
Key differences: Rainbow Trout lack the 'cutthroat' mark. They typically have a pink or red lateral stripe and more uniformly distributed, often larger, black spots. Their caudal fin is usually more deeply forked.
Brown Trout
Salmo trutta
Key differences: Brown Trout have dark spots (some with red halos) on their sides, but no 'cutthroat' mark. They often have a more yellowish belly and a squarer caudal fin. Their spots are typically larger and less numerous than CRCT.
Brook Trout
Salvelinus fontinalis
Key differences: Brook Trout are char, not true trout. They have distinctive worm-like markings (vermiculations) on their back and dorsal fin, and white leading edges on their lower fins (pectoral, pelvic, anal) often with a black stripe. They lack the 'cutthroat' mark and have red spots with blue halos on their sides.
Other Cutthroat Trout Subspecies
Oncorhynchus clarkii spp.
Key differences: Distinguishing CRCT from other cutthroat subspecies (e.g., Greenback, Yellowstone, Bonneville) can be challenging and often requires genetic analysis or detailed meristic counts. However, general geographic range, specific spotting patterns, and coloration nuances can provide clues. For example, Greenback Cutthroat (O. c. stomias) typically have larger, more irregular spots concentrated posteriorly, and often a more greenish-gold hue. Yellowstone Cutthroat (O. c. bouvieri) often have larger, more irregular spots and a more yellowish body.
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