Chinook salmon

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Chinook salmon

a Pacific salmon, Oncorhynchus tschawytscha, valued as a food fish

Chinook Salmon

 

(Oncorhynchus tshawytscha), also king salmon or black salmon, a fish of the genus Oncorhynchus, comprising the Pacific salmon. The Chinook salmon differs from other salmon in the large number of gill rays, which number 15 to 19. The back is covered by tiny, roundish black spots, as are the dorsal and caudal fins. The Chinook salmon is the largest of all the Pacific salmon. The body length of the representatives caught off Kamchatka averages 90 cm, and the weight 8–10 kg; some have been known to weigh more than 50 kg. The Chinook salmon is distributed in the northern part of the Pacific Ocean, inhabiting areas along the coast of North America, from Alaska to California, and areas along the coast of Asia, from the Anadyr’ River to Amur Bay.

The Chinook salmon attains sexual maturity at three to seven years of age. It spawns in July and August on the Kamchatka Peninsula; in the rivers of North America it also spawns in the autumn and winter. The fish enter the rivers in the spring, swimming far upstream. Fecundity is 4,200 to 20,000 eggs, which are large, nearly the size of the eggs of the chum salmon (O. keta). The fry live in rivers from the age of three or four months to one to two years of age.

A very valuable commercial fish, the Chinook salmon is bred and acclimatized.

REFERENCES

Nikol’skii, G. V. Chastnaia ikhtiologiia, 3rd ed. Moscow, 1971.
Zhizn’ zhivotnykh, vol. 4, part 1. Moscow, 1971.
Smirnov, A. I. Biologiia, razmnozhenie i razvitie tikhookeanskikh lososei. Moscow, 1975.

A. I. SMIRNOV

chinook salmon

[shə¦nu̇ ′sa·mən]
(vertebrate zoology)
Oncorhynchus tshawytscha. The Pacific's largest salmon, possibly exceeding 46 kilograms (100 pounds) at maturity, often spawns in tributaries located a considerable distance from the ocean. Also known as king salmon.
References in periodicals archive ?
Surface, planktonic, and benthic foraging by juvenile Chinook salmon (Oncorhynchus tshawytscha) in turbid laboratory conditions.
(2002) Resistance to three pathogens in the endangered winter-run Chinook salmon (Oncorhynchus tshawytscha): Effects of inbreeding and major histocompatibility complex genotypes.
tshawytscha Chinook, king, chub, black, blackmouth, tyee, spring, springer, winter, ivory, Columbia River, hook bill, or quinnat salmon O.
Specifically, we focus on the cases of two salmonids in two distinct settings: Chinook salmon (Oncorhynchus tshawytscha) in the Klamath River of southern Oregon and northern California, and steelhead trout (Oncorhynchus my kiss) in the John Day River of north-central Oregon.
The scaling and potential importance of cutaneous and branchial surfaces in respiratory gas exchange in young chinook salmon (Oncorhynchus tshawytscha).
Masculinization of chinook salmon (Oncorhynchus tshawytscha) by immersion treatments using 17a-methyltestosterone around the time of hatching.
The effects of purified alcohol extracts from soy products on feed intake and growth of chinook salmon (Oncorhynchus tshawytscha) and rainbow trout (Oncorhynchus mykiss).
The toxicity of glyphosate, in the Rodeo[R] formulation, and the mixture of glyphosate + 0.5% of surfactant Aterbane[R] BR were similar to the formulation Rodeo[R] with the surfactant X-77 to Salmo gairdneri and Oncorhynchus tshawytscha with (LC 50;96h) of 1070 and 1440 mg [L.sup.-1] (MITCHELL et al., 1987); to Hybognathus amarus and to Pimephales promelas with (LC 50;96h) higher than 1000 mg [L.sup.-1] (BEYERS, 1995).
Analysis of microsatellite DNA resolves genetic structure and diversity of chinook salmon (Oncorhynchus tshawytscha) in California's Central Valley.
Inter- and intra-population variation in the fecundity of chinook salmon (Oncorhynchus tshawytscha) and its relevance to life history theory.