Hexanchus nakamurai, Bigeyed sixgill shark : fisheries

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Hexanchus nakamurai Teng, 1962

Bigeyed sixgill shark
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Native range | All suitable habitat | Point map | Year 2050
This map was computer-generated and has not yet been reviewed.
Hexanchus nakamurai   AquaMaps   Data sources: GBIF OBIS
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Image of Hexanchus nakamurai (Bigeyed sixgill shark)
Hexanchus nakamurai
Picture by Murch, A.

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

Elasmobranchii (tubarões e raias) (sharks and rays) > Hexanchiformes (Frill and cow sharks) > Hexanchidae (Cow sharks)
Etymology: Hexanchus: hex (Gr.), six; anchus, etymology unclear, perhaps anchos (Gr.), choke or throttle, referring to how six gill openings of H. griseus extend down onto the throat. (See ETYFish);  nakamurai: In honor of Teng’s colleague Hiroshi Nakamura, Fisheries Experiment Station of the Government-General during the Japanese occupation of Taiwan, who illustrated this species as H. griseus in 1936. (See ETYFish).

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

marinhas batidemersal; intervalo de profundidade 0 - 700 m (Ref. 125614), usually 90 - 600 m (Ref. 6574). Deep-water; 33°N - 36°S, 30°E - 178°W

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

Indo-West Pacific: patchily distributed in most warm-temperate and tropical seas.

Comprimento de primeira maturação / Tamanho / Peso / Idade

Maturity: Lm ?, range 142 - ? cm
Max length : 180 cm TL macho/indeterminado; (Ref. 125614); 142.0 cm TL (female)

Descrição suscinta Morfologia | Morfometria

Vértebras: 155. This slender-bodied shark is readily distinguished from its larger congener (H. griseus) by having a narrower head, relatively larger eyes, 5 large lower comb-shaped anterolateral teeth, a long slender dorsal-caudal space, with distance from the dorsal origin to the upper caudal origin being at least twice the length of the dorsal fin base; with the upper and lower caudal postventral margins forming a strong arch. In life, Color of dorsum a uniform pale brown without a light line extending along the lateral body trunk, the trailing fin edges are white in some specimens and the ventral surface is lighter (Ref. 94780).

Biologia     Glossário (p.ex. epibenthic)

Found on continental and island shelves and slopes, occasionally near surface or inshore from 0 to 700 m depth. Feeds on small to medium-sized bony fishes and occassionally on crustaceans. Viviparous, with 13-26 young in a litter (Ref. 125614). Size at birth measures to about 40-43 cm TL (Ref. 94780). It is taken as bycatch within its range, but is not commercially important (Ref. 125614). Utilized for its fins, meat and liver oil but of little value due to its relatively small size (Ref. 58048).

Ciclo de vida ou comportamento de acasalamento Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

Viviparous, with number of young 13 in one litter. Length at birth about 43 cm (Ref. 125614). Distinct pairing with embrace (Ref. 205).

Referência principal Upload your references | Referências | Coordenador : Compagno, Leonard J.V. | Colaboradores

Ebert, D.A., W.T. White and H.-H. Ho, 2013. Redescription of Hexanchus nakamurai Teng 1962, (Chondrichthyes: Hexanchiformes: Hexanchidae), with designation of a neotype. Zootaxa 3752(1):020-034. (Ref. 94780)

Status na Lista Vermelha da UICN (Ref. 130435)

  Quase ameaçada (NT) (A2d); Date assessed: 21 November 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para os humanos






Uso pelos humanos

Pescarias: pesca de subsistência
FAO - Publication: search | FishSource |

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Fontes da internet

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Checar Observador de Peixes (FishWatcher) | CISTI | Catalog of Fishes: Gênero, Espécies | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genoma, nucleotídeo | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Bases de dados nacionais | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Árvore da vida | Wikipedia: Ir para, procura | World Records Freshwater Fishing | Registro zoológico

Estimates based on models

Preferred temperature (Ref. 123201): 8.1 - 23.9, mean 14.4 °C (based on 1233 cells).
Índice de diversidade filogenética (Ref. 82804):  PD50 = 0.8281   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00240 (0.00102 - 0.00563), b=3.14 (2.93 - 3.35), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Nível Trófico (Ref. 69278):  4.2   ±0.7 se; based on diet studies.
Resiliência (Ref. 120179):  Muito baixo(a), tempo mínimo de duplicação da população maior que 14 anos (Fec = 13).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (90 of 100).
Categoria de preço (Ref. 80766):   Unknown.