分類 / Names
共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性; potamodromous (Ref. 59043). Temperate; 6°C - 18°C (Ref. 2059); 50°N - 44°N, 8°E - 21°E
Europe: Danube drainage. Introduced into other European river basins when their numbers declined due to ecological changes in the Danube.
Length at first maturity / サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 150 cm TL オス/雌雄の選別がない; (Ref. 11243); common length : 70.0 cm TL オス/雌雄の選別がない; (Ref. 682); 最大公表体重: 52.0 kg (Ref. 719); 最大記録サイズ: 20 年 (Ref. 59043)
簡単な記述
検索表 | 形態学 | 形態計測学
背面の脊椎 (合計) : 3 - 5; 背鰭 (合計) : 8 - 14; 肛門の骨: 3 - 5; 臀鰭: 7 - 14; 脊つい: 66 - 72. Distinguished from other species of Salmonidae in central and eastern Europe by the following combination of characters: lateral line with 180-200 scales; no red spots and white fin margins; head dorsally flattened and long ( 22-24% SL); body roundish; caudal fin deeply emarginate; large size (in undisturbed areas); usually 13-19 gill rakers (Ref. 59043).
Usually solitary, inhabits deeper regions of swift flowing streams with oxygen rich waters. Adults are territorial but not solitary (Ref. 26170). Carnivore. Juveniles feed mainly on invertebrates and adults mostly on fishes, but also prey on amphibians, reptiles, small mammals and waterfowl (Ref. 26170). Important sport fish with minimum size of catch from 50-55 cm. Transplantations of young artificially incubated and reared fish have not been successful. Depletion of stocks due to overexploitation, industrial pollution, waterway redirection and badly designed or non-existent fish ladders in dams and reservoirs. Territorial, but migrates short distances upstream for spawning (Ref. 556). Reported to be one of the biggest freshwater fishes of the world, reaching a length of over 2 m and weight of over 100 kg (Ref. 26170); which is probably erroneous (A. Mangold, pers. comm.).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Sexually mature fish migrate upstream into smaller and shallower (0.3-1.5 m deep) streams (Ref. 26170), usually in upper reaches of tributaries (Ref. 59043). Males arrive first at spawning sites. Males defend females against other individuals. Spawning usually occurs during daytime (Ref. 59043). Spawns on gravelly bottom where female makes a shallow hole where the eggs are laid and covered with gravel (Ref. 682). Both sexes covered the eggs with substrate. They both defend the spawning site up to 2 weeks after spawning. Eggs usually hatch after 25-40 days. Larvae stay in gravel until yolk sac is absorbed after 8-14 days (Ref. 59043). Young remain near spawning area feeding on bottom fauna. Spawns with snow melt, in shallow water in Danube or affluents (Ref. 682).
Kottelat, M., 1997. European freshwater fishes. An heuristic checklist of the freshwater fishes of Europe (exclusive of former USSR), with an introduction for non-systematists and comments on nomenclature and conservation. Biologia, Bratislava, 52/Suppl. 5:1-271. (Ref. 13696)
IUCNのレッドリストの状況は (Ref. 130435: Version 2024-2)
Human uses
水産業: 商業; 水産養殖: 商業; ゲームフィッシュ: はい
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01230 (0.00729 - 0.02077), b=3.01 (2.86 - 3.16), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
栄養段階 (Ref.
69278): 4.2 ±0.74 se; based on food items.
Generation time: 11.0 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
回復力 (Ref.
120179): 低い, ４．５年～１４年の倍増期間の最小個体群 (tm=5; tmax=20).
Fishing Vulnerability (Ref.
59153): High to very high vulnerability (68 of 100).
