Longnose spurdog (Squalus blainville) fish species and information / pictures of Longnose spurdog - Squalus blainville

Longnose spurdog (Squalus blainville) fish species information

Scientific Name
Squalus blainville

Common Name
Longnose spurdog

Biology
Found on the continental shelves and upper slopes. Depth range from 16-440 m (Ref. 0247), and from 300-780m in the eastern Ionian Sea (Ref. 56504). Forms schools. Off West Africa, water temperature and salinity where this species is often found ranges from 11-18?C and 36 ppt. (at 16 to 255 m depth), respectively. Feeds on bony fishes, like denticids, mackerel and percichthyids, as well as crabs, lobsters, and octopi. Ovoviviparous, with 3 to 4 young per litter. Utilized fresh, dried salted and smoked for human consumption.

Classification

Classified By
Risso, 1827
Class
Sharks and Rays (Elasmobranchii)
Order
Bramble, Sleeper and Dogfish sharks (Squaliformes)
Family
Dogfish sharks (Squalidae)

Distribution

Region
Eastern Atlantic
Distribution
Eastern Atlantic: Bay of Biscay to Mediterranean, Morocco, Senegal to Namibia (these records may include other species in addition to Squalus blainvillei). Although reported from the Canary Islands (e.g. Ref. 247), it is most likely based on misidentifications of Squalus megalops (Ref. 6808). Western Pacific: southern Japan and Taiwan. Nominal records of Squalus blainvillei or Squalus fernandinus from the western Atlantic (North Carolina, USA to northern Gulf of Mexico; Argentina), Indian Ocean (South Africa, Mozambique, Madagascar, Tanzania and India) and the Pacific (Australia, New Zealand, New Caledonia, Hawaii and northern Chile), as well as some records from the northwest Pacific and eastern Atlantic are based at least in part on Squalus mitsukurii and possibly other species. Whether Squalus blainvillei itself is as wide-ranging as reported for blainvillei-group dogfishes (including Squalus mitsukuri
Range
50°N - 29°S, 17°W - 43°E

Environment

Climate
Subtropical
Water Temperature From
11 °C
Water Temperature To
18 °C
Depth From - meters
16 m
Depth To - meters
780 m
Zone
demersal
Environment
Marine; brackish; demersal; depth range 16 - 780 m (Ref. 56504)
Trophic Level
3.97 s.e. 0.57 Based on diet studies.
Occurs in Marine / Salt water
True
Occurs in Brackish water
True
Occurs in Fresh Water
False
Occurs on Reefs
False
Is kept in Aquariums
False

Physical Size and Genetics

Maximum Length
100.0 cm
Common Length
Unknown cm
Phylogenetic Diversity Index
PD50 = 0.5000 many relatives (e.g. carps) 0.5 - 2.0 few relatives (e.g. lungfishes)

Human Uses and Population

Human Uses
Fisheries: commercial
Vulnerability
High to very high vulnerability (70 of 100)
Resilience
Very Low, minimum population doubling time more than 14 years (K=0.10-0.14; Fec=3)
Threat To Humans
  Harmless
IUCN Red List Status
  Data deficient (DD)