Common names from other countries
Teleostei >
Salmoniformes (Salmons)
鮭形目 (Salmons) >
Salmonidae (Salmonids)
鮭科 (Salmonids) > Salmoninae
Etymology: Oncorhynchus: Greek, onyx, -ychos = nail + Greek, rhyngchos = snout (Ref. 45335); mykiss: Oncorhynchus=hooked snout; mykiss=a vernacular name for the species in Kamchatka, Russia (Ref. 79012).
More on author: Walbaum.
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋; 淡水; 半鹹淡水 底中水層性; 溯河洄游 (Ref. 51243); 深度上下限 0 - 200 m (Ref. 50550). 溫帶; 10°C - 24°C (Ref. 12741); 67°N - 32°N, 135°E - 117°W
Pacific Slope from Kuskokwim River drainage in Alaska to Otay River drainage in California, USA. Widely introduced and established in Canada and USA, including Arctic, Atlantic, Great Lakes, Mississippi River, and Rio Grande basins, and elsewhere in the world (Ref. 86798). Eastern Pacific: Kamchatkan Peninsula and have been recorded from the Commander Islands east of Kamchatka and sporadically in the Sea of Okhotsk as far south as the mouth of the Amur River along the mainland. The records outside Kamchatka probably represent migrating or straying Kamchatkan steelhead (penshinensis) rather than the established native population (Reg. 50080). Several countries report adverse ecological impact after introduction.
西南大西洋: 阿根廷.(參考文獻 9086) 東太平洋: 勘察加半島而且曾經記錄從指揮官島勘察加以東而且偶而在鄂霍次克海中向南遠至阿穆爾河河口沿著大陸。 勘察加以外的記錄可能代表移動或迷路勘察加鮭 ( penshinensis) 而不是確定的原生族群 (普通型的。 50080)。 一最，廣泛地被引入的魚種, 可能是視為全球的在它的存在分布中。 在熱帶中侷限於在 1,200 公尺上面的區域。 引入後的一些國家報告不利的生態衝擊.(參考文獻 5723)
Length at first maturity / 大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 122 cm TL 雄魚/尚未辨別雌雄; (Ref. 96339); common length : 60.0 cm TL 雄魚/尚未辨別雌雄; (Ref. 5504); 最大體重: 25.4 kg (Ref. 7251); 最大年齡: 11 年 (Ref. 12193)
背棘 (總數) : 0; 背的軟條 (總數) : 14 - 16; 臀棘: 0; 臀鰭軟條: 6 - 12; 脊椎骨: 60 - 66. Diagnosis: Body elongate, somewhat compressed especially in larger fish. No nuptial tubercles but minor changes to head, mouth and color occur especially in spawning males. Colouration varies with habitat, size, and sexual condition; stream residents and spawners darker, colours more intense; lake residents lighter, brighter, and more silvery. Caudal fin with 19 rays (Ref. 2196). Differs from Oncorhynchus gorbuscha by having the following unique characters: anal fin with 6-9½ (usually 8½ ) branched rays; 115-130 scales in midlateral row; 16-17 gill rakers; breeding males lacking hump; juveniles lacking parr marks; wide pink to red stripe from head to caudal base, except in sea-run form; and juveniles with 5-10 parr marks (Ref. 59043).
細長的身體, 略微扁長形的尤其在較大的魚中。 沒有珠星但是較小的變成頭部，嘴與顏色尤其在生育期的雄魚中出現。 體色隨著棲息地，大小與性別狀態改變。 溪流魚種與產卵魚比較黑的, 顏色更密集。 湖泊魚種顏色淡的﹐比較明亮的﹐與更銀色的。 尾鰭有 19個鰭條。 (參考文獻 2196)
Inhabit clear, cold headwaters, creeks, small to large rivers, lakes, and intertidal areas (Ref. 86798). Anadromous in coastal streams (Ref. 5723). Stocked in almost all water bodies as lakes, rivers and streams, usually not stocked in water reaching summer temperatures above 25°C or ponds with very low oxygen concentrations. Feed on a variety of aquatic and terrestrial invertebrates and small fishes. At the sea, they prey on fish and cephalopods. Mature individuals undertake short spawning migrations. Anadromous and lake forms may migrate long distances to spawning streams (Ref. 59043). Utilized fresh, smoked, canned, and frozen; eaten steamed, fried, broiled, boiled, microwaved and baked (Ref. 9988). Cultured in many countries and is often hatched and stocked into rivers and lakes especially to attract recreational fishers (Ref. 9988).
Reported not to establish breeding populations if the peak emergence of fry corresponds to flood season and cold summer temperatures and if temperature does not fall below 13° C (Ref. 59043). Males mature generally at 2 years and females at 3. Spawning happens from November until May in the Northern hemisphere and from August to November on the Southern hemisphere. The size of the eggs depends on the size of the female. In captivity spawning is fostered by abdominal massage. Egg size 3-6 mm, fry length after hatching 12-20 mm. Hatchlings are well developed and equipped with a large yolk sac.
The female finds a spot and digs a pit. While digging, an attendant male courts her or is busy driving away other males. As soon as the pit is completed, the female drops into it and is immediately followed by the male. The pair is side by side, they open their mouth, quiver and release egg and sperm. Females produce from 700 to 4,000 eggs per spawning event (Ref. 4706). At this point, a subordinate male moves in and releases sperm into the nest. The female quickly moves to the upstream edge of the nest and starts digging a new pit, covering the eggs. The whole process is repeated for several days until the female deposits all her eggs (Ref. 27547). Young fish move downstream at night, shortly after emergence (Ref. 4706).
Reproductive strategy: synchronous ovarian organization, determinate fecundity (Ref. 51846).西南大西洋: 阿根廷.(參考文獻 9086) 東太平洋: 勘察加半島而且曾經記錄從指揮官島勘察加以東而且偶而在鄂霍次克海中向南遠至阿穆爾河河口沿著大陸。 勘察加以外的記錄可能代表移動或迷路勘察加鮭 ( penshinensis) 而不是確定的原生族群 (普通型的。 50080)。 一最，廣泛地被引入的魚種, 可能是視為全球的在它的存在分布中。 在熱帶中侷限於在 1,200 公尺上面的區域。 引入後的一些國家報告不利的生態衝擊.(參考文獻 5723)
Page, L.M. and B.M. Burr, 2011. A field guide to freshwater fishes of North America north of Mexico. Boston : Houghton Mifflin Harcourt, 663p. (Ref. 86798)
CITES (Ref. 128078)
Not Evaluated
人類使用
漁業: 高經濟性; 養殖: 商業性; 游釣魚種: 是的
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Estimates based on models
Preferred temperature (Ref.
115969): 1.3 - 10, mean 5.4 (based on 315 cells).
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00933 (0.00730 - 0.01193), b=3.03 (2.98 - 3.08), in cm Total Length, based on LWR estimates for this species (Ref.
93245).
營養階層 (Ref.
69278): 4.1 ±0.3 se; based on diet studies.
回復力 (Ref.
120179): 中等的, 族群倍增時間最少 1.4 - 4.4年 (K=0.38-0.46; tm=2-5; tmax=11; Fec=200).
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (43 of 100).
Climate Vulnerability (Ref.
125649): Moderate to high vulnerability (52 of 100).
