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Silurus biwaensis (Tomoda, 1961)

Eurasian catfish
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Silurus biwaensis
Picture by Jean-Francois Helias / Fishing Adventures Thailand

分類 / Names 俗名 | 同種異名 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii 輻鰭魚綱 (條鰭魚) > Siluriformes (Catfish) 鯰形目 (Catfish) > Siluridae (Sheatfishes) 鯰科 (Sheatfishes)
Etymology: Silurus: Greek, silouros = a cat fish + Greek, odous = teeth (Ref. 45335).

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

; 淡水 居於水底的.   溫帶

分布 國家 | FAO區域 | 生態系 | 發現紀錄 | Point map | 簡介 | Faunafri

Asia: Endemic to Lake Biwa, Japan.
亞洲: 琵琶湖,日本的特有種。

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 118 cm TL 雄魚/尚未辨別雌雄; (Ref. 40637); 最大體重: 17.2 kg (Ref. 40637)

生物學特性     字彙 (例如 epibenthic)

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

在日本鯰魚魚之中的大種.(參考文獻 37518)

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | | 孕卵數 | 仔魚

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.亞洲: 琵琶湖,日本的特有種。

主要參考資料 Upload your references | 參考文獻 | 合作者 | 合作者

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 瀕危狀態 (Ref. 119314)

  未評估 

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

對人類具威脅

  無害處的





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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).
營養階層 (Ref. 69278):  4.2   ±0.8 se; Based on size and trophs of closest relatives
回復力 (Ref. 69278):  非常低的, 最小族群倍增時間超過14 年 (Preliminary K or Fecundity.).
瀕危性 (Ref. 59153):  High to very high vulnerability (71 of 100) .