A large group of mainly freshwater fish related to salmon. Several species are marine fish and ascend rivers to breed. Trout are primarily a sport fish; trout are raised commercially in pens for food use. The most widely known species of trout include rainbow trout, Salmo gairdneri; brook trout, Salvelinus fontinalis; steelhead or salmon trout, a variety of rainbow trout; cutthroat trout, Salmo clarki; and Dolly Varden, Salvelinus malma. Steelhead trout is an ocean-going rainbow trout. Lake trout is a large deep-lake trout found in Canada, the Great Lakes, and in deep lakes of the Northeast.

ake trout from the Great Lakes is likely to be contaminated with industrial pollutants such as PBBs, PCBs, and PESTICIDES. Great Lakes states have set limits for weekly consumption of game fish from these lakes. It is recommended that pregnant women avoid eating contaminated fish regardless of their source. Trout is sauteed, grilled, baked, or poached. It can be substituted for salmon in recipes. The nutrient content of a 3-oz. (85 g) trout is: 126 calories; protein, 17.7 g; fat, 5.6 g; cholesterol, 49 mg; thiamin, 0.28 mg; riboflavin, 0.26 mg; niacin, 7.6 mg