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| status = NT | status_system = iucn3.1 | status_ref = | image = Prionace glauca 1.jpg | regnum = Animalia | phylum = Chordata | classis = Chondrichthyes | subclassis = Elasmobranchii | superordo = Selachimorpha | ordo = Carcharhiniformes | familia = Carcharhinidae | genus = ''Prionace'' | genus_authority = Cantor, 1849 | species = ''P. glauca'' | binomial = ''Prionace glauca'' | binomial_authority = (Linnaeus, 1758) | range_map = Cypron-Range Prionace glauca.svg | range_map_caption = Range of the blue shark }} The blue shark (''Prionace glauca'') is a species of requiem shark, in the family Carcharhinidae, that inhabits deep waters in the world's temperate and tropical oceans. Preferring cooler waters, blue sharks migrate long distances, such as from New England to South America. Although generally lethargic, they can move very quickly. Blue sharks are viviparous and are noted for large litters of 25 to over 100 pups. They feed primarily on small fish and squid, although they can take larger prey. Maximum lifespan is still unknown, but it is believed that they can live up to 20 years.〔(Sharks, Emerging Species Profile Sheets, published by the Department of Fisheries and Aquaculture, Government of Newfoundland and Labrador; undated )〕 ==Anatomy and appearance== Blue sharks are light-bodied with long pectoral fins. Like many other sharks, blue sharks are countershaded: the top of the body is deep blue, lighter on the sides, and the underside is white. The male blue shark commonly grows to at maturity, whereas the larger females commonly grow to at maturity.〔(FLMNH Ichthyology Department: Blue Shark ). Flmnh.ufl.edu. Retrieved on 2012-12-19.〕 Large specimens can grow to long. Occasionally, an outsized blue shark is reported, with one widely printed claim of a length of , but no shark even approaching this has been confirmed in this species.〔 The blue shark is fairly elongated and slender in build and typically weighs from in males and from in large females.〔(Blue Shark (Prionace glauca) – Ireland's Wildlife ). Irelandswildlife.com (2011-07-21). Retrieved on 2012-12-19.〕〔(Sharks – Greenland (''Somniosus microcephalus''), Shortfin Mako (''Isurus oxyrinchus''), Blue Shark (''Prionace glauca''), Basking Shark (''Cetorhinus maximus''), and Porbeagle (''Lamna nasus''). ) fishaq.gov.nl.ca〕〔(Sea Angling in Ireland – Blue Shark ). Sea-angling-ireland.org (2006-10-21). Retrieved on 2012-12-19.〕 Occasionally, a female in excess of will weigh over . The heaviest reported weight for the species was .〔(Summary of Large Blue Sharks Prioncae glauca (Linnaeus, 1758) in progress ). elasmollet.org (March 2008)〕 The blue shark is also ectothermic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「blue shark」の詳細全文を読む スポンサード リンク
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