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Definition of RAINBOW TROUT
: a large stout-bodied salmonid fish (Oncorhynchus mykiss syn. Salmo gairdneri) of western North America that is related to the Pacific salmon and is typically greenish above and white on the belly with a pink, red, or lavender stripe along each side of the body and with profuse black dots — compare steelhead
Species (Oncorhynchus mykiss) of fish in the salmon family (Salmonidae) noted for spectacular leaps and hard fighting when hooked. It has been introduced from western North America to many other countries. A brightly coloured fish of lakes and swift streams, it is covered with small black spots and has a reddish band along either side. The steelhead, a large, bluish, oceangoing form, is also a prized game fish. Rainbow trout may weigh 6 lb (2.8 kg); steelheads (and rainbows in large lakes) may weigh 10–20 lb (4.5–9 kg) or more. Another form of rainbow, the Kamloops, or Kootenay, trout of Idaho, may exceed 30 lb (14 kg).