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Shark picture - green sawfish

Bigeye Sixgill Shark

View all available Bigeye Sixgill Shark Pictures in the Shark Pictures Database

Common Names: Bigeye sixgill shark, Sixgill shark, bigeyed sixgill, cow shark.

Latin Name: Hexanchus nakamurai

Family: Hexanchidae

Identification: Six gill slits. Sender body (compared to H.griseus). Single dorsal fin set well back above anal fin. Caudal fin with distinct lower lobe and deeply notched upper lobe. Large round pupils reflect a luminous green. Five rows of large comb shaped teeth.

Size: 180cm maximum. Size at birth 40-43cm.

Habitat: Temperate and tropical seas. Usually at great depth (90 to 620m). Long line collection in Cape Eleuthera by Edd Brooks (Cape Eleuthera Institute) indicates that bigeye sixgill sharks may inhabit greater depths than previously recorded.

Abundance and distribution: Found worldwide - Western Atlantic from Florida, Bahamas, Northern Caribbean, Atlantic Panama and Costa Rica and Venzuela to Northern Brazil. Eastern Atlantic from Southern Europe to North Africa including much of the Mediterranean Sea. Indian Ocean off of East Africa and Western Australia and in the Western Pacific from Japan and the Philippines and Eastern Australia. Not recorded in the Eastern Pacific. Distribution records are patchy because the bigeye sixgill shark is a rarely caught species. Many isolated pockets in this species' range may eventually be linked once more catch data becomes available.

Red List Status: Data deficient. Sometimes taken as bi-catch in line fisheries and as part of the artisanal shark fishery in the Gulf of Mexico.

Diet: Small to medium sized bony fishes and crustaceans.

Reproduction: Ovoviviparous. 13-26 pups per litter.

Photographs: Cape Eleuthera, Bahamas. Photographed during a tagging study conducted by Edd Brooks of the Cape Eleuthera Institute.

Similar species: Bluntnose sixgill Hexanchus griseus. The bluntnose sixgill shark can be identified by its generally larger size and stockier body, its indistinct lower caudal lobe and lack of a notch in the upper caudal lobe.

Reaction to divers: Not applicable however a captured specimen showed aggressive behavior when manhandled during release.

Diving logistics: Not applicable

References and further reading:

IUCN Red List of Endangered Species: http://www.iucnredlist.org/apps/redlist/details/161352/0

Cape Eleuthera Institute Shark Ecology Program http://www.ceibahamas.org/shark-ecology.aspx

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