Abstract
The slimy sculpin ( Cottus cognatus), spoonhead sculpin ( Cottus ricei), and deepwater sculpin ( Myoxocephalus thompsoni) are abundant fishes in Lake Superior. Slimy and spoonhead sculpins occupy a zone from near shore to depths of 210 m but are generally most abundant in waters 50 to 90 m deep. Deepwater sculpins are found in waters from 15 to 407 m deep and are most abundant at depths greater than 70 m. All three species of sculpins eat mainly burrowing amphipods ( Pontoporeia affinis) although deepwater sculpins also eat substantial quantities of opossum shrimp ( Mysis relicta). The three sculpins grow at similar rates. Among the fishes aged, the maximum age of slimy sculpins was 5 years, compared with 6 years for spoonhead sculpins, and 7 years for deepwater sculpins. Indirect evidence indicates that slimy and spoonhead sculpins spawn in the spring, and deepwater sculpins spawn in midwinter.
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