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Silurus biwaensis (Tomoda, 1961)

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

条鰭類 > Siluriformes (Catfish) > Siluridae (Sheatfishes)
Etymology: Silurus: Greek, silouros = a cat fish + Greek, odous = teeth (Ref. 45335).

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

; 新鮮な水 底生の.   Temperate

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

Asia: Endemic to Lake Biwa, Japan.

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 118 cm TL オス/雌雄の選別がない; (Ref. 40637); 最大公表体重: 17.2 kg (Ref. 40637)

生物学     用語集 (例 epibenthic)

Largest species among the Japanese silurid fishes (Ref. 37518).

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

Based on observations, a female first searches for a spawning site, with a male following behind. Immediately the female stops, the male first places his head under that of the female and then, by bending his body towards her anal fin, positions himself such that his tail is towards the end of the female's snout. From this position, the male then begins to wrap his tail around the head of the female, gradually winding his body tighter and moving along the body of the female until positioned at the center of her body. The male then winds his body tightly around the dorsal side of the female's abdomen for 20-30 seconds. The female then shakes her head from side to side several times, and orientates her body downward. This behavior causes the male to become separated from the female. Immediately after separation, the female releases a large number of eggs, and circles around with the male following on the inside. Although gamete release by the male was not actually observed, it seems likely that the eggs are fertilized during circling. After circling, the pair turns round twice violently, causing the eggs to become widely scattered. The pair then swim away with the female in the lead.

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

Kobayakawa, M., 1989. Systematic revision of the catfish genus Silurus, with description of a new species from Thailand and Burma. Jap. J. Ichthyol. 36(2):155-186. (Ref. 9417)

IUCNのレッドリストの状況は (Ref. 119314)


CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

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FAO(Publication : search) | FishSource |

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5001   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00676 (0.00402 - 0.01136), b=3.01 (2.86 - 3.16), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  4.2   ±0.8 se; Based on size and trophs of closest relatives
回復力 (Ref. 69278):  非常に低い, 14年以上の倍増期間の最小個体群 (Preliminary K or Fecundity.).
弱み (Ref. 59153):  High to very high vulnerability (71 of 100) .