Dallia pectoralis Bean, 1880
Alaska blackfish
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Dallia pectoralis
画像によって Whitman, M.
画像 | グーグルの画像
画像によって Whitman, M.
分類 / 名前 共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa
> Esociformes (Pikes and mudminnows) > Umbridae (Mudminnows)
Eponymy: William Healey Dall (1845–1927) was an America naturalist. [...] (Ref. 128868), visit book page.
More on author: Bean.
Eponymy: William Healey Dall (1845–1927) was an America naturalist. [...] (Ref. 128868), visit book page.
More on author: Bean.
環境：環境 / 気候帯 / 深さの範囲 / 分布範囲 生態学
分布 領土 | 国連食糧農業機関の区域 | エコシステム | 事件 | 目的のマップ | 導入 | Faunafri
North America: Alaska from Colville River delta south to central Alaska Peninsula near Chignik; upstream in Yukon-Tanana drainage to near Fairbanks. Also Bering Sea islands and northeastern Siberia, Russia.
サイズ / 重さ / 年齢
成熟: Lm ? range ? - ? cm
Max length : 33.0 cm TL オス/雌雄の選別がない; (Ref. 5723); common length : 10.8 cm TL オス/雌雄の選別がない; (Ref. 12193); 最大公表体重: 366.00 g (Ref. 28675); 最大記録サイズ: 8 年 (Ref. 12193)
Max length : 33.0 cm TL オス/雌雄の選別がない; (Ref. 5723); common length : 10.8 cm TL オス/雌雄の選別がない; (Ref. 12193); 最大公表体重: 366.00 g (Ref. 28675); 最大記録サイズ: 8 年 (Ref. 12193)
簡単な記述 検索表 | 形態学 | 形態計測学
背面の脊椎 (合計) : 0; 背鰭 (合計) : 10 - 14; 肛門の骨: 0; 臀鰭: 12 - 16; 脊つい: 40 - 42. Identified by its short, flattened snout, the rearward location of the dorsal and anal fins, the presence of about 33 rays in the pectorals, and the presence of a pelvic fin that has only 3 rays (Ref. 27547). Gill rakers short; lateral line with minute pores: 76 to 100 scales in midlateral series (Ref. 27547). Dorsal located far back on body; anal more or less under dorsal; edge of pectorals rounded; pelvic fins very small and located just before anus; caudal broad and rounded (Ref. 27547). Dark green or brown above and on upper sides, pale below with dark speckles; four to six irregular dark bars or blotches on sides; fins have dark brownish specklings; dorsal, anal and caudal fins with pale margin, which are pink to red in spawning adults (Ref. 27547).
Body shape (shape guide): fusiform / normal.
Body shape (shape guide): fusiform / normal.
Facultative air-breathing (Ref. 126274); Usually found in heavily vegetated swamps and ponds; occasionally in medium to large rivers and lakes with abundant vegetation (Ref. 5723). Migrations appear to be limited to inshore or upstream movements to spawning grounds in the spring and (presumably) reverse migrations to deeper water in the fall (Ref. 27547). Oviparous, batch spawner (Ref. 205). Known for their tolerance to cold water: survives exposures to -20°C for up to 40 minutes, and can survive for a few days after complete freezing of parts of the body, even the head (Ref. 28673, 28674). Uses its esophagus as auxiliary breathing organ (Ref. 27797).
ライフサイクルと交尾行動 成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Upstream movement appears to coincide with a rise of water temperature to 10° to 15°C (Ref. 3829). Females normally contain two sets of eggs, the smaller group presumably being the set which will be spawned the following year. Females deposit 40 to 300 eggs, the number increasing with size. A female probably spawns over a period of several days, possibly longer, with only a few eggs being extruded at each spawning act. (Ref. 27547).
主な参考文献
参考文献のアップロード | 参考文献 | コーディネーター | 協力者
Page, L.M. and B.M. Burr, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref. 5723)
CITES
Not Evaluated
人間に対する脅威
Harmless
人間の用途
水産業: 食糧水産; 水族館・水槽: 商業
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モデルに基づく推定値
系統多様性指数 (参照 82804): PD50 = 0.6329 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00871 (0.00419 - 0.01809), b=3.10 (2.91 - 3.29), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
栄養段階 (参照 69278): 3.3 ±0.44 se; based on food items.
回復力 (参照 120179): 手段, １．４年～４．４年の倍増期間の最小個体群 (tm=2-3; tmax=8; Fec=40-300).