23 Facts About Rainbow trout

Rainbow trout is a species of trout native to cold-water tributaries of the Pacific Ocean in Asia and North America.

The rainbow trout is included in the list of the top 100 globally invasive species.

Lake resident rainbow trout are usually found in moderately deep, cool lakes with adequate shallows and vegetation to support production of sufficient food sources.

These small juvenile Rainbow trout are sometimes called 'fingerlings' because they are approximately the size of a human finger.

The brain mitochondria of rainbow trout show decreased levels of docosahexaenoic acid and a lower peroxidation index, suggesting a lower susceptibility of damage by oxidative stress and a different reaction to growth compared to heart mitochondria.

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Rainbow trout are predators with a varied diet and will eat nearly anything they can capture.

Rainbow trout, including juvenile steelhead in fresh water, routinely feed on larval, pupal and adult forms of aquatic insects.

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 trout.

The range of coastal rainbow trout extends north from the Pacific basin into tributaries of the Bering Sea in northwest Alaska, while forms of the Columbia River redband trout extend east into the upper Mackenzie River and Peace River watersheds in British Columbia and Alberta, Canada, which eventually drain into the Beaufort Sea, part of the Arctic Ocean.

Since 1875, the rainbow trout has been widely introduced into suitable lacustrine and riverine environments throughout the United States and around the world.

Since 1870, rainbow trout have been artificially propagated in fish hatcheries to restock streams and to introduce them into non-native waters.

The first rainbow trout hatchery was established on San Leandro Creek, a tributary of San Francisco Bay, in 1870, and trout production began in 1871.

Rainbow trout are commercially farmed in many countries throughout the world.

Rainbow trout farming is one of the largest finfish aquaculture industries in the U S They are raised inland in facilities where raceways or ponds have continuously flowing water with little pollution and a low risk of escape.

Populations of many rainbow trout subspecies, including anadromous forms of (coastal rainbow trout) and (Columbia River redband trout) have declined in their native ranges due to over-harvest, habitat loss, disease, invasive species, pollution and hybridization with other subspecies, and some introduced populations, once healthy, have declined for the same reasons.

Such introductions into the ranges of redband Rainbow trout have severely reduced the range of pure stocks of these subspecies, making them "species of concern" in their respective ranges.

The Beardslee trout, a genetically unique lake-dwelling variety of the coastal rainbow trout that is isolated in Lake Crescent, is threatened by the loss of its only spawning grounds in the Lyre River to siltation and other types of habitat degradation.

Rainbow trout are a popular target for fly fishers, and several lure fishing methods are used.

Rainbow trout can be caught on various live and dead natural baits.

Many of these introductions have resulted in environmental and ecological problems, as the introduced rainbow trout disrupt local ecosystems and outcompete or prey upon indigenous fishes.

Rainbow trout is popular in Western cuisine; both wild-caught and farmed fish are eaten.

Rainbow trout raised to have pinker flesh from a diet high in astaxanthin are sometimes sold in the U S with labeling calling them "steelhead".

Rainbow trout is sometimes used as a biological indicator for water quality in water purification facilities.