Japan country information

Common names: Biwako-ônamazu, Biwako-ô-namazu, Biwako-oo-namazu
Occurrence: endemic
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: gamefish: yes;
Comments: Endemic to Lake Biwa (Ref. 559). Status of threat in the 2005 Red Data Book of Shiga Prefecture : rare (Ref. 79825). Also Ref. 78994.
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/ja.html
National Fisheries Authority: http://www.maff.go.jp/eindex.html
Occurrences: Occurrences Point map
Main Ref: Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984
National Database:

Common names from other countries

琵琶湖鯰, Lake Biwa catfish, Biwa säga, ... more

Classificação / Names Nomes comuns | Sinónimos | Catalog of Fishes(Género, Espécies) | ITIS | CoL | WoRMS | Cloffa

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

Environment: milieu / climate zone / depth range / distribution range Ecologia

; Água doce demersal. Temperate

Distribuição Países | Áreas FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

Asia: Endemic to Lake Biwa, Japan.

Tamanho / Peso / Idade

Maturity: L_m ? range ? - ? cm
Max length : 118 cm TL macho/indeterminado; (Ref. 40637); peso máx. Publicado: 17.2 kg (Ref. 40637)

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

Life cycle and mating behavior Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

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.

Referência principal Upload your references | Referências | Coordenador | Colaboradores

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)

Categoria na Lista Vermelha da IUCN (Ref. 130435)

Não avaliado

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para o homem

Harmless

Utilização humana

Peixe desportivo: sim

FAO(Publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00562 (0.00278 - 0.01137), b=3.00 (2.83 - 3.17), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Nível Trófico (Ref. 69278): 4.2 ±0.8 se; based on size and trophs of closest relatives

Resiliência (Ref. 120179): Muito baixo, tempo mínimo de duplicação da população maior que 14 anos (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): High to very high vulnerability (71 of 100).

Silurus biwaensis (Tomoda, 1961)