Bigeyed sixgill shark (Hexanchus nakamurai) fish species and Bigeyed sixgill shark information

Scientific Name
Hexanchus nakamurai

Common Name
Bigeyed sixgill shark

Biology
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). Not dangerous to people as far as is known (Ref. 247). Utilised for its fins, meat and liver oil but of little value due to its relatively small size (Ref.58048).

Classification

Classified By

Teng, 1962

Class

Sharks and Rays (Elasmobranchii)

Order

Frill and cow sharks (Hexanchiformes)

Family

Cow sharks (Hexanchidae)

Distribution

Region

Western Central Atlantic

Distribution

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 C?te 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).

Range

49°N - 35°S, 99°W - 161°E

Environment

Climate

Deep-water

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

0 m

Depth To - meters

600 m

Zone

bathydemersal

Environment

Marine; bathydemersal; depth range 0 - 600 m (Ref. 5578), usually 90 - 600 m (Ref. 6874)

Trophic Level

4.24 s.e. 0.70 Based on diet studies.

Occurs in Marine / Salt water

True

Occurs in Brackish water

False

Occurs in Fresh Water

False

Occurs on Reefs

False

Is kept in Aquariums

False

Physical Size and Genetics

Maximum Length

180 cm

Common Length

120 cm

Phylogenetic Diversity Index

PD50 = 0.8281 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: subsistence fisheries

Vulnerability

Very high vulnerability (81 of 100)

Resilience

Very Low, minimum population doubling time more than 14 years (Fec = 13)

Threat To Humans

Harmless (Ref. 247)

IUCN Red List Status

Data deficient (DD)

Bigeyed sixgill shark (Hexanchus nakamurai) fish species and information / pictures of Bigeyed sixgill shark - Hexanchus nakamurai

Bigeyed sixgill shark (Hexanchus nakamurai) fish species information

Classification

Distribution

Environment

Physical Size and Genetics

Human Uses and Population