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 2100
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.

Klassifizierung / Names Namen | Synonyme | Catalog of Fishes(Gattung, Arten) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (Haie und Rochen) (sharks and rays) > Hexanchiformes (Frill and cow sharks) > Hexanchidae (Cow sharks)
Etymology: Hexanchus: Greek, exa = six + Gree, agcho, narrow (Ref. 45335);  nakamurai: Named for Dr. Hiroshi Nakamura.

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

; seewasser bathydemersal; tiefenbereich - 600 m (Ref. 5578), usually 90 - 600 m (Ref. 6874).   Deep-water; 0°C - ; 49°N - 35°S, 99°W - 161°E (Ref. 55216)

Verbreitung Länder | FAO Gebiete | Ecosystems | Vorkommen | Point map | Einführungen | Faunafri

Wide-ranging, patchily distributed species, in warm temperate and tropical seas (Ref. 94780). Western Central Atlantic: Mexico (Ref. 13186), off Bahamas, northern Cuba, Nicaragua and Costa Rica. Eastern Atlantic: France to Morocco, including Mediterranean Sea (Ref. 13573); possibly Côte d'Ivoire and Nigeria. Indian Ocean: off eastern and southern Africa (Ref. 13573), Aldabra Island (India); Western Australia (Ref. 6871). Western Pacific: Japan, Taiwan, Philippines, New Caledonia and eastern Australia (Ref. 13573).

Length at first maturity / Size / Gewicht / Alter

Maturity: Lm ?, range 142 - 178 cm
Max length : 180 cm TL Männchen/unbestimmt; (Ref. 247); common length : 120 cm TL Männchen/unbestimmt; (Ref. 5217)

Kurzbeschreibung Morphologie | Morphometrie

Wirbelzahl: 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).

Biologie     Fachlexikon (Englisch) (z.B. epibenthic)

Found on continental and insular shelves and upper slopes, from 90 to 600 m depth, usually on or near bottom, may move to the surface at night (Ref. 247, 5578). Probably feeds on bony fish and crustaceans (Ref. 13573). Ovoviviparous (Ref. 205), with 13 young in a litter (Ref. 247). Size at birth measures to about 40-43 cm TL (Ref. 94780). Not dangerous to people as far as is known (Ref. 247). Utilized for its fins, meat and liver oil but of little value due to its relatively small size (Ref.58048).

Life cycle and mating behavior Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fecundity | Larven

Ovoviviparous, with number of young 13 in one litter. Length at birth about 43 cm (Ref. 247). Distinct pairing with embrace (Ref. 205).

Hauptreferenz Upload your references | Referenzen | Koordinator : Compagno, Leonard J.V. | Partner

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)

IUCN Rote Liste Status (Ref. 124695)

  Gefährdung zunehmend (NT) (A2d); Date assessed: 21 November 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

  Harmless (Ref. 247)





Nutzung durch Menschen

Fischereien: kleinfischerei
FAO - Publication: search | FishSource |

Mehr Information

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Internet Quellen

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | FishWatcher Einträge suchen | CISTI | Catalog of Fishes: Gattung, Arten | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: Genom, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Nationale Datenbanken | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Gehe zu, Suchen | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Preferred temperature (Ref. 115969): 8.1 - 23.9, mean 14.4 °C (based on 1233 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.8281   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00339 (0.00131 - 0.00878), b=3.11 (2.88 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic level (Ref. 69278):  4.2   ±0.7 se; based on diet studies.
Widerstandsfähigkeit (Ref. 120179):  sehr niedrig, Verdopplung der Population dauert mehr als 14 Jahre. (Fec = 13).
Verwundbarkeit (Ref. 59153):  Very high vulnerability (81 of 100) .
Preiskategorie (Ref. 80766):   Unknown.