Answer: Rainbow trout, aka Steelhead: "rainbow" refers to the colors on the sides of the stream-dwelling type; "steelhead" refers to the steel-gray head color of the type that runs to the ocean (in Lake Superior in our case) Rainbow trout are coldwater fish that have long been associated with clear, healthy mountain streams and lakes in North America. Because of their ability to thrive in hatcheries, rainbow trout have been introduced into much of the United States and now inhabit many streams and lakes throughout the country.
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