Slimy Sculpin and Similar Species
Cottus cognatus
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Open the appSeveral fish can be confused with Slimy Sculpin. Here are the key differences.
Species often confused with {name}
Mottled Sculpin
Cottus bairdii
Key differences: The Slimy Sculpin typically has a shorter lateral line that ends before the caudal fin, whereas the Mottled Sculpin's lateral line is usually complete or nearly complete, extending to the caudal fin base. Slimy Sculpins also tend to have fewer preopercular spines (often 1-2, blunt) compared to Mottled Sculpins (often 2-4, sharper). The palatine teeth are usually absent in Slimy Sculpin but present in Mottled Sculpin.
Spoonhead Sculpin
Cottus ricei
Key differences: The Spoonhead Sculpin has a distinctive, very broad and flattened head, giving it a 'spoon-like' appearance, and a more slender body. It also typically has a complete lateral line and a prominent, sharp preopercular spine. Its habitat is often deeper and colder than that of the Slimy Sculpin.
Deepwater Sculpin
Myoxocephalus thompsonii
Key differences: While sometimes confused, the Deepwater Sculpin (formerly Cottus thompsonii) is now in a different genus. It is typically found in much deeper, colder waters of large lakes. Morphologically, it often has a more pronounced, sharper preopercular spine and a more robust body than the Slimy Sculpin. Genetic analysis is often required for definitive differentiation.
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