Oncorhynchus nerka, Sockeye salmon : fisheries, aquaculture, gamefish, aquarium

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Oncorhynchus nerka (Walbaum, 1792)

Sockeye salmon
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Native range | All suitable habitat | Point map | Year 2100
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Oncorhynchus nerka   AquaMaps   Data sources: GBIF OBIS
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Image of Oncorhynchus nerka (Sockeye salmon)
Oncorhynchus nerka
Female picture by Keeley, E.R.

分類 / Names 共通名の | 類義語 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

条鰭類 > Salmoniformes (Salmons) > Salmonidae (Salmonids) > Salmoninae
Etymology: Oncorhynchus: Greek, onyx, -ychos = nail + Greek, rhyngchos = snout (Ref. 45335);  nerka: nerka which is the Russian name for the anadromous form (Ref. 1998).  More on author: Walbaum.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 海; 新鮮な水; 汽水性の; 昇流魚 (Ref. 51243); 深さの範囲 0 - 250 m (Ref. 50550).   Temperate; 0°C - 25°C (Ref. 35682); 72°N - 42°N, 130°E - 109°W (Ref. 117423)

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

North Pacific: northern Japan to Bering Sea and to Los Angeles, California, USA (Ref. 2850). Artic and Pacific drainages from Point Hope in Alaska to Columbia River drainage in Oregon and Idaho in USA. Landlocked populations in Alaska, Yukon Territory and British Columbia in Canada, and Washington, Oregon, and California in USA (Ref. 86798).

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm 60.0  range ? - ? cm
Max length : 84.0 cm TL オス/雌雄の選別がない; (Ref. 86798); 71.0 cm (female); common length : 45.0 cm TL オス/雌雄の選別がない; (Ref. 9988); common length :58 cm (female); 最大公表体重: 7.7 kg (Ref. 40637); 最大記録サイズ: 8 年 (Ref. 72462)

簡単な記述 形態学 | 形態計測学

背面の脊椎 (合計): 0; 背鰭 (合計): 11-16; 肛門の骨 0; 臀鰭: 13 - 18; 脊つい: 56 - 67. Both the sockeye and the kokanee are distinguished by the long, fine, serrated, closely spaced gill rakers on the first arch that number between 30 and 40, and by its lack of definite spot on the back and tail (Ref. 27547). Body fusiform, streamlined, laterally compressed, body depth moderate, slightly deeper in breeding males (Ref. 6885). Head bluntly pointed, conical, eye rather small, position variable with sex and condition; snout rather pointed (Ref. 6885). Lateral line straight (Ref. 27547). Pelvic fins with axillary process; caudal emarginate (Ref. 27547). Pre-spawning fish are dark steel blue to greenish blue on the head and back, silvery on the sides and white to silvery on the belly; no definite spots on the back, although some individuals may have dark speckling and irregular marks on the dorsal fin (Ref. 27547). At spawning, the head of the males becomes bright to olive green, with black on the snout and upper jaw; the adipose and anal fins turn red and the paired fins and tail generally become grayish to green or dark; females are generally less brilliantly colored than males (Ref. 27547). Various populations may show less brilliant colors, and a few turn dull green to yellowish, with little if any red (Ref. 27547).

生物学     用語集 (例 epibenthic)

Epipelagic (Ref. 58426). Occurs in open ocean and lakes and migrates up to coastal streams to spawn (Ref. 86798). There are two forms, the anadromous form known as the sockeye and the landlocked form (with a much smaller maximum size) known as the kokanee (Ref. 27547). Upon emergence from gravel, fry at first tends to avoid light, hiding during the day and emerging at night (Ref. 27547). In some populations, sockeye fry go to the sea during their first summer but most spend one or two (rarely three or four) years in a lake before migrating (Ref. 30333). In a few streams of the Copper River drainage in Alaska, young sockeye stay in the stream (Ref. 27547). Once in the lake, the young spend a few weeks inshore, feeding largely on ostracods, cladocerans and insect larvae. The fish then become pelagic and move offshore, where they feed on plankton in the upper 20 m or so (Ref. 27547). Seaward migration follows with the young individuals first staying fairly close to shore, feeding mainly on zooplankton, but also on small fishes and insects (Ref. 30343, 30346). With growth, they head out to sea and fish become important in the diet (Ref. 27547). Kokanee are confined to lake-stream systems, and most of its life is spent in the lake (Ref. 27547). They feed mainly on plankton, but also take insects and bottom organisms (Ref. 1998). Kokanee, wherever they are native, have been derived from anadromous populations, and each kokanee population apparently has evolved independently from a particular sockeye run (Ref. 30338, 30339). Offspring of kokanee occasionally become anadromous, and sockeye offspring occasionally remain in freshwater (Ref. 27547). Lifespan of the kokanee varies from two to seven years in different stocks (Ref. 27547). The sockeye is one of the most commercially important Pacific salmons; the kokanee is primarily a sport fish but also makes excellent food and in some areas well regarded as food for large trout (Ref. 27547). Marketed fresh, dried or salted, smoked, canned, and frozen; eaten steamed, fried, broiled, microwaved, and baked (Ref. 9988).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

Adult sockeyes return to natal streams to spawn. This occurs during summer and fall and as late as December in the southern part of the range. The female selects a site, usually with gravel bottom, and digs a nest. During nest building, the female is attended by a dominant male and a few subordinate males. At this stage, females tend to be aggressive toward other females and subordinate males; males are aggressive toward other males. Between digging acts, the female will rest over the pit while the dominant male courts her. Once the nest is completed, the female enters the nest, followed immediately by the dominant male who comes close beside her. Their mouths gape, and the pair vibrates to release eggs and sperm. One or more subordinate males may come to the other side of the female and join in the spawning. The female then moves to the upstream edge of the nest and digs again, covering the old nest, at the same time creating a new one just upstream from the previous one. A female normally needs 3 to 5 days to deposit all her eggs and utilizes 3 to 5 nests for this purpose. She may spawn with several dominant males. A male may breed with several females. All adult sockeye die after spawning (Ref. 27547). Reproductive strategy: synchronous ovarian organization, determinate fecundity (Ref. 51846).

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

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)

IUCNのレッドリストの状況は (Ref. 120744)

  軽度懸念 (LC) ; Date assessed: 24 November 2010

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業: 高い商業の; 水産養殖: 商業; ゲームフィッシュ: はい; 水族館・水槽: 公共の水族館
FAO(水産養殖: 代謝; 水産業: 代謝, 種の外形; publication : search) | FishSource | 私達の周りの海

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インターネットの情報源

Estimates based on models

Preferred temperature (Ref. 115969): 1 - 8.4, mean 4.2 (based on 374 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
栄養段階 (Ref. 69278):  3.5   ±0.2 se; Based on diet studies.
Generation time: 2.9 ( na - na) years. Estimated as median LN(3)/K based on 2 growth studies.
回復力 (Ref. 120179):  手段, 1.4年~4.4年の倍増期間の最小個体群 (K=0.37-0.58; tm=2-4; tmax=7; Fec=300).
Prior r = 0.56, 95% CL = 0.37 - 0.85, Based on 6 stock assessments.
弱み (Ref. 59153):  Low to moderate vulnerability (32 of 100) .
価格帯 (Ref. 80766):   Very high.