Tuesday, July 31, 2007

Blue shark fact sheet

Prionance glauca | Blue shark 

The blue shark is a small shark with asymmetrical colouration: the back is metalic blue and the belly is white or cream coloured. This species has a slender body form, a long snout, long and curved pectoral fins and dorsal fin that is set far back, being closer to the pelvic fin. The tail fin is asymmetrical, with the upper lobe being longer than the bottom lobe. Blue sharks have big eyes that are protected by inner eyelids that close in case of danger, as in others species from the Carcharhinidae family. This species can be found all around the world, mostly in open water, in tropical and temperate regions  (in waters of 7 to 21º C ).  They are viviparous, reaching maturity after 4 to 5 years of age (with a length of about 2.5 m). Gestation lasts almost one year ( 9 to 12 months). In Portugal this species is a target for sport fishing and is also caught as bycatch (30% of all fish fished by fishing fleets is blue shark).


Length:
Adult: 1,7 - 2,21 m (max: 4m)
Pup: 50 - 61 cm

Weight: 205,9 kg (max)

Depht:
Average: < 20m
Max: 200m

Longevity: 20 years

Gestation: 9 - 12 months  (20 - 50 pups per litter)

Conservation Status: Near Threatened


In other languages 
Portuguese: Tubarão-azul/tintureira/guelha
Spanish: Tintorera/tiburón azul
French: Requin bleu
Italian: Verdesca/squalo azzurro
German: Blauhai
Dutch: Grote blauwe haai
Swedish: Blåhaj
Norwegian: Blåhai
Danish: Blåhaj
Finnish: Sinihai
Polish: Żarłacz błękitny/rekin błękitny
Russian: Си́няя аку́ла/голуба́я аку́ла

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