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The rainbow trout (Oncorhynchus mykiss) is a species of trout native to cold-water tributaries of the Pacific Ocean in North America and Asia. The steelhead (sometimes called steelhead trout) is an anadromous (sea-run) form of the coastal rainbow trout (O. m. irideus) or Columbia River redband trout (O. m. gairdneri) that usually returns to freshwater to spawn after living two to three years ...
Steelhead in 1924 illustration using the original taxonomic name, Salmo gairdneri The freshwater form of the steelhead is the rainbow trout (Oncorhynchus mykiss).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.
As rainbow trout grow, the proportion of fish consumed increases in most populations. Some lake-dwelling forms may become planktonic feeders. In rivers and streams populated with other salmonid species, rainbow trout eat varied fish eggs, including those of salmon, brown and cutthroat trout, mountain whitefish, and the eggs of other rainbow ...
The rainbow trout has a steelhead subspecies, generally accepted as coming from Sonoma Creek. The rainbow trout of New Zealand still show the steelhead tendency to run up rivers in winter to spawn. [2] In Australia, the rainbow trout was introduced in 1894 from New Zealand and is an extremely popular gamefish in recreational angling. [3]
An invasive species. Rainbow smelt are anadromous and move from saltwater to freshwater streams to spawn. They can live completely in freshwater and habit rivers, streams, lakes, and reservoirs. They are invasive because they eat larva of other species and species food resources but not only that fish species eggs.
The masu salmon (Oncorhynchus masou) is actually considered a trout ("cherry trout") in Japan, with masu actually being the Japanese word for trout. On the other hand, the steelhead and sea trout , the anadromous forms of rainbow trout and brown trout respectively, are from the same genera as salmon and live identical migratory lives, but ...
The Kamchatkan rainbow trout ("mikizha") comprises various ecological forms, including anadromous and resident freshwater forms and their intermediates. [6] [7] Russian taxonomy has long attributed the rainbow trout to the genus Parasalmo, and has further considered the Kamchatkan rainbow trout as composed of two distinct species, Parasalmo mykiss and Parasalmo penshinensis, whose ranges overlap.
Some coastal rainbow trout (Oncorhynchus mykiss irideus) and Columbia River redband trout (O. m. gairdneri) populations also display reddish or pink throat markings. [23] At maturity, different populations and subspecies of cutthroat trout can range from 6 to 40 inches (15 to 102 cm) in length, depending on habitat and food availability.