Rainbow Trout are freshwater fish found in streams and lakes in every continent except Antarctica. Because of their tough fighting and good eating they are one of the most commonly sought after fish. They are typically blue-green with pink or red streak along their sides and have small black spots on their back and fins. Their underbelly is white. Their average weight is 1 to 10 pounds and their average length is 10 to 25 inches. They live 4 to 6 years in the wild. An anadromous Rainbow Trout is known as a Steelhead. Rainbow trout are predators with a varied diet of insects, crustaceans, and small fish.