Mottled Sculpin and Similar Species
Cottus bairdi
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Open the appSeveral fish can be confused with Mottled Sculpin. Here are the key differences.
Species often confused with {name}
Slimy Sculpin
Cottus cognatus
Key differences: The Slimy Sculpin typically has a single, sharp preopercular spine, whereas Mottled Sculpin often has 2-4 spines, with the uppermost being the largest. Slimy Sculpin also tends to have a more slender caudal peduncle and often lacks the distinct mottling of C. bairdi, appearing more uniformly colored or with less defined patterns. The palatine teeth are usually absent in C. cognatus but present in C. bairdi.
Banded Sculpin
Cottus carolinae
Key differences: Banded Sculpin typically has 3-4 distinct dark vertical bands on its sides, which are usually more pronounced and regular than the mottling on C. bairdi. It also generally has a more robust body and a shorter, deeper caudal peduncle. The preopercular spine is usually blunt or absent in C. carolinae, unlike the sharp spine(s) of C. bairdi.
Torrent Sculpin
Cottus rhotheus
Key differences: Torrent Sculpin generally has a more elongated and slender body, and its pectoral fins are typically shorter, not extending past the anal fin origin. It often has a more pointed snout and a less flattened head than the Mottled Sculpin. The preopercular spine is usually single and sharp, similar to Slimy Sculpin, but other morphological features and geographic range help distinguish it.
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