The responses of slimy sculpin and white sucker differed, perhaps in relation to differences in life history characteristics. The sculpin were found to be less active and have lower rates of reproduction when found in these waters. Margin of first dorsal fin normally clear, but turns bright red in spawning males. Inhabits rocky riffles of cold streams, rocky areas of lakes (commonly at 90-106 m depth), springs and their effluents (Ref. Native Range Northern North America to extreme northeastern Siberia. They are intolerant of impaired water qualities. This project will use genetic testing to explore the survival and reproduction rates of slimy sculpin (Cottus cognatus, a small, bottom-dwelling forage fish) translocated into several southern Minnesota streams. Three pelvic fin rays. The influence of acidic runoff episodes on slimy sculpin reproduction in Stone Run. Slimy Sculpin (Cottus cognatus) General Information Sculpins prefer high gradient waters with rock, gravel substrate, which limits their distribution to the northern waters of the state. However, scul pins are also prey for brown trout (Jones 1972; Gard and Fl ittner Quantitative methods in electrical fishings in Swedish salmon rivers. whether slimy sculpin would spawn in the study. Identification. 27547).In some areas, they are common in brackish water (Ref. The slimy sculpin has been studied in waters where there is current acidification (water that is more acidic). Results from this study indicate the slimy sculpin is a suitable fish species for monitoring rivers that receive multiple industrial and municipal effluents. 27843), presumably moving to and from fresh water, at least for spawning (Ref. Slimy Sculpin Reproduction 385 Fecundity was determined for slimy sculpins col lected near Olcott and Nine Mile Point, New York during April to May in 1989, 1991, and 1993. In North America, it occurs from the two study reaches in 1998, 56 per stream on. The sculpin were found to be less active and have lower rates of reproduction when found in these waters. Waters (1975) reported that no trout eggs or fry were ever found in stomachs of the slimy sculpin, Cottus cognatus, in \Ialley Creek, t~innesota. Mottled brown with dark blotches over entire body and fins. A 3-inch adult slimy sculpin. 1976. From the evi de nee then, 1-1e know that scul pins prey on trout and sa 1mon fry in the wild environment. Reproduction. Slimy Sculpin (Cottus cognatus) - Native. Slimy sculpin reproduction.—T o determine. The slimy sculpin has been studied in waters where there is current acidification (water that is more acidic). streams, we released equal numbers of fish into. Karlstrom O. Fish were pooled across years as it was difficult to ob tain all sizes of gravid females, especially the very small and large individuals every year. 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