Pacific sleeper shark (Somniosus pacificus) fish species and information / pictures of Pacific sleeper shark - Somniosus pacificus

Pacific sleeper shark (Somniosus pacificus) fish species information

Scientific Name
Somniosus pacificus

Common Name
Pacific sleeper shark

Biology
Dorsal spines (total): 0; Anal spines: 0; Anal soft rays: 0. Diagnosis: Somniosus pacificus differs from S. antarcticus by the following characters: interdorsal space about 70% of prebranchial length (vs. 80%); height of first dorsal fin about 3.7% of precaudal length (PCL) (vs. 3.0%); height of second dorsal fin about 3.4% of PCL (vs. 2.9%); number of turns in spiral valve 32-37 (mode 33) (vs. 36-41, mode 39); precaudal vertebrae 28-30 (mode 29) (vs. 30-31, mode 30) (Ref. 50224).

Classification

Classified By

Bigelow & Schroeder, 1944

Class

Sharks and Rays (Elasmobranchii)

Order

Bramble, Sleeper and Dogfish sharks (Squaliformes)

Family

Sleeper sharks (Somniosidae)

Distribution

Region

North Pacific.

Distribution

North Pacific.

Range

70°N - 47°S

Environment

Climate

Temperate

Water Temperature From

Unknown °C

Water Temperature To

Unknown °C

Depth From - meters

0 m

Depth To - meters

2000 m

Zone

benthopelagic

Environment

Marine; benthopelagic; depth range 0 - 2000 m (Ref. 26346)

Trophic Level

4.25 s.e. 0.50 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

440 cm

Common Length

Unknown cm

Phylogenetic Diversity Index

PD50 = 0.5313 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses

Fisheries: of no interest

Vulnerability

Very high vulnerability (87 of 100)

Resilience

Low, minimum population doubling time 4.5 - 14 years (Fec=300; assuming tm

Threat To Humans

Harmless (Ref. 6871)

IUCN Red List Status

Data deficient (DD)