![]() The body of the steelhead trout is silvery and streamlined with a rounder head. They can live up to 11 years and spawn multiple times. ![]() Steelhead are also larger and less colorful than rainbow trout, and can weigh up to 55 lb (25 kg) and reach 45 in (110 cm) in length. The difference between these forms of the species is that steelhead migrate to the ocean and return to freshwater tributaries to spawn, whereas non-anadromous rainbow trout do not leave freshwater. The freshwater form of the steelhead is the rainbow trout ( Oncorhynchus mykiss). Description Steelhead in 1924 illustration using the original taxonomic name, Salmo gairdneri Steelhead are iteroparous, although survival is approximately 10–20%. Like other sea-run (anadromous) trout and salmon, steelhead spawn in freshwater, smolts migrate to the ocean to forage for several years and adults return to their natal streams to spawn. Steelhead are native to cold-water tributaries of the Pacific basin in Northeast Asia and North America. gairdneri, also called redband steelhead). Steelhead, or occasionally steelhead trout, is the common name of the anadromous form of the coastal rainbow trout ( Oncorhynchus mykiss irideus) or Columbia River redband trout ( O. ( March 2021) ( Learn how and when to remove this template message)Īdult steelhead showing color upon returning to fresh water Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
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