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BiologyA slow-growing fish which inhabits rivers. A cold water fish and never goes to the ocean; finds deep cold waters during summer; can be found under the ice in late fall and winter (Ref. 12218). Feeds on larval and adult insects, amphipods, small fish, frogs, mice and salmon spawn (Ref. 593). During spawning the body turns to a dark red and the dorsal and pectoral fins change to a rainbow of colors (Ref. 12218).