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Hexanchus nakamurai Teng, 1962
BIGEYE SIXGILL SHARK
Bigeyed Sixgill Shark; Hexanchus griseus nakamurai Teng, 1962

Life   Vertebrata   Fish   Hexanchidae   Hexanchus


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Following modified from Australian Faunal Directory
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http://biodiversity.org.au/afd/taxa/17704013-16e2-454c-8d2a-ed1382e5dbb7 ---> https://biodiversity.org.au/afd/taxa/17704013-16e2-454c-8d2a-ed1382e5dbb7
https://biodiversity.org.au/afd/taxa/17704013-16e2-454c-8d2a-ed1382e5dbb7 ---> http://biodiversity.org.au/afd/taxa/b1d85641-a0f6-46e5-8b14-09985c1680f0;jsessionid=0A5430380EB93DBDCE248E72516B5DF2
http://biodiversity.org.au/afd/taxa/b1d85641-a0f6-46e5-8b14-09985c1680f0;jsessionid=0A5430380EB93DBDCE248E72516B5DF2 ---> https://biodiversity.org.au/afd/taxa/b1d85641-a0f6-46e5-8b14-09985c1680f0;jsessionid=0A5430380EB93DBDCE248E72516B5DF2
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Following modified from Taiwan Biodiversity National Information Network
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Kingdom Animalia  
 Phylum Chordata  
 Class Chondrichthyes  
 Order Hexanchiformes  
 Family Hexanchidae  
 Genus Hexanchus  
  Hexanchus nakamurai    Teng, 1962 
Provider: Pofeng Lee& Shoou-Jeng Joung 
hierarchy tree    download xml    download txt    Chinese Page    
Synonyms: Hexanchus griseus nakamurai Hexanchus vitulus Notidanus griseus   details
Citation: 臺灣魚類誌(沈等, 1993); 中國動物誌-圓口綱及軟骨魚綱(朱等, 2001); FAO Species Catalogue, Vol.4 Sharks of the world
Character: A moderate-sized, slender-bodied, narrow-headed six gill shark. Head pointed. Eyes large. Lower jaw with 5 rows of large, comblike teeth on each side, these with relatively long cusps. Caudal peduncle long and slender, distance from dorsal insertion to upper caudal origin at least twice the length of dorsal fin base. 
Habitat: A uncommon, deepwater shark species. Ovoviviparous, number of embryos 13. Maximum size is about 180 cm in TL, size at maturity estimated to be about 43 cm. Females mature at 142-178 cm, males at 123-157. 
Distribution: Western North Atlantic including Bahamas, northern Cuba, Nicaragua and Cost Rica. Eastern Atlantic including Gibraltar, Ivory Coast and Nigeria. Indian Ocean including southern Africa, Aldabra Island, Madagascar and Kenya. Western Pacific including Taiwan 
Utility: Usually taken by line gear and trawls. Stock size very limited and of relatively slight importance to fisheries. 
Name Code: 383119
  IUCN Red List:DD       Marine     
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Following modified from FishBase
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http://www.fishbase.org/Summary/speciesSummary.php?genusname=Hexanchus&speciesname=nakamurai ---> https://www.fishbase.se/Summary/speciesSummary.php?genusname=Hexanchus&speciesname=nakamurai
https://www.fishbase.se/Summary/speciesSummary.php?genusname=Hexanchus&speciesname=nakamurai ---> https://www.fishbase.se/summary/Hexanchus-nakamurai.html

Common name (e.g. trout)

Genus + Species (e.g. Gadus morhua)

Hexanchus nakamurai Teng , 1962

Bigeyed sixgill shark Add your observation in Fish Watcher
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Hexanchus nakamurai   AquaMaps   Data sources: GBIF OBIS
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Pictures | Google image Image of Hexanchus nakamurai (Bigeyed sixgill shark) Hexanchus nakamurai
Picture by Murch, A.

Classification / Names Common names | Synonyms | Catalog of Fishes ( gen. , sp. ) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (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 Ecology

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

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | 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 / Weight / Age

Maturity: L m   ? , range 142 - 178 cm
Max length : 180 cm TL male/unsexed; (Ref. 247 ); common length : 120 cm TL male/unsexed; (Ref. 5217 )

Short description Morphology | Morphometrics

Vertebrae : 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 ).

Biology     Glossary (e.g. 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 Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

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

Main reference Upload your references | References | Coordinator : Compagno, Leonard J.V. | Collaborators

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 Red List Status (Ref. 120744 )

  Data deficient (DD)  ; Date assessed: 01 December 2008

CITES (Ref. 115941 )

Not Evaluated

CMS (Ref. 116361 )

Not Evaluated

Threat to humans

  Harmless (Ref. 247 )




Human uses

Fisheries: subsistence fisheries FAO(Publication : search ) | FishSource |

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Estimates of some properties based on models

Preferred temperature (Ref. 115969 ): 8.1 - 23.9, mean 14.4 (based on 1233 cells). Phylogenetic diversity index (Ref. 82805 ):  PD 50 = 0.8281   [Uniqueness, from 0.5 = low to 2.0 = high]. Trophic Level (Ref. 69278 ):  4.2   ±0.7 se; Based on diet studies. Resilience (Ref. 69278 ):  Very Low, minimum population doubling time more than 14 years (Fec = 13). Vulnerability (Ref. 59153 ):  Very high vulnerability (81 of 100) . Price category (Ref. 80766 ):   Unknown .

Entered by Carpenter, Kent E. Modified by Capuli, Estelita Emily Fish Forum
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Updated: 2020-01-27 08:26:49 gmt
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