Blue shark (Prionace glauca)
|Researched by||Nuno Queiroz||Refereed by||Admin|
|Other common names||-||Synonyms||-|
Recorded distribution in Britain and IrelandBlue sharks undertake north-south migrations in the north-east Atlantic and seasonally visit western British and Irish waters in the summer.
HabitatThe blue shark is probably the widest ranging shark found in the main oceans and seas of the world, from the surface to at least 400 m depth. Blue sharks are a migratory species.
- Slender body.
- Long and narrow snout.
- Large eyes.
- Pectoral fins very narrow and somewhat falcate.
- Colour intense deep blue above, white below.
Additional informationThe blue shark is often seen cruising slowly at the surface, with its large pectoral fins outspread, and its first dorsal fin and terminal caudal lobe out of the water. It is a viviparous species and the number of young varies from 4 to 135 per litter, with a size at birth around 40 cm. The gestation period is from 9 to 12 months, and possible maximum longevity is around 20 years. Males mature around 180 to 200 cm and females around 220 cm in length.
The blue shark feeds on relatively small prey, especially squid and bony fishes, though other invertebrates, small sharks, and mammalian carrion is readily taken and seabirds occasionally are caught at the surface of the water. Squid are a very important prey of the blue shark and some species form huge breeding aggregations, which are attended by blue sharks. Much of the prey of the blue shark is pelagic, though bottom fishes and invertebrates figure in its diet also.This common oceanic shark is usually caught with pelagic longlines but also pelagic trawls, and even bottom trawls near coasts.
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OBIS (Ocean Biodiversity Information System), 2023. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2023-12-11
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West Wales Biodiversity Information Centre, 2018. Seatrust Cetacean Records West Wales. Occurrence dataset: https://doi.org/10.15468/ecsmqh accessed via GBIF.org on 2018-10-02.
This review can be cited as:
Last Updated: 02/01/2007