The rainbow trout (oncorhynchus mykiss) is a species of salmonid native to tributaries of the Pacific Ocean in Asia and North America. The steelhead is a sea or lake run rainbow trout. They are anadromous usually returning to freshwater to spawn after two to three years at sea; raoinbow trout and steelhead are the same species. Several other fish in the salmonid family are called trout; some are anadromous like salmon, whereas others are resident in freshwater only. The species has been introduced for food or sport to at least 45 countries and every continent except Antarctica.
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