What is Blue shark?
{{Taxobox | fossil_range = {{Fossil range|Pliocene|Recent|ref=<ref>{{cite journal | last = Sepkoski | first = Jack | title = A compendium of fossil marine animal genera (Chondrichthyes entry) | journal = Bulletins of American Paleontology | volume = 364 | pages = 560 | year = 2002 | url = http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=575&rank=class | access-date = 2008-01-09 | archive-date = 2012-05-10 | archive-url = https://web.archive.org/web/20120510170834/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=575&rank=class | url-status = dead }}</ref>}} | name = Blue shark | image = Prionace_glauca_1.jpg | status = NT | status_system = IUCN3.1 | status_ref =<ref>{{IUCN|assessors=Stevens |year=2005 |id=39381 |title=Prionace glauca |version=2010.4 |downloaded=April 10, 2011}}</ref> | regnum = [[Animal]]ia | phylum = [[Chordata]] | classis = [[Chondrichthyes]] | subclassis = [[Elasmobranchii]] | ordo = [[Carcharhiniformes]] | familia = [[Carcharhinidae]] | genus = '''''Prionace''''' | genus_authority = [[Theodore Edward Cantor|Cantor]], 1849 | binomial = ''Prionace glauca'' | binomial_authority = ([[Carolus Linnaeus|Linnaeus]], 1758) | range_map = Cypron-Range Prionace glauca.svg | range_map_width = 250px | range_map_caption = Range of the blue shark}} The '''blue shark''' (''Prionace glauca'') is a [[species]] of [[Carcharhinidae|requiem shark]]. It has a slim, smooth-looking body with large eyes, and a long, cone-shaped snout. The dorsal surface is a dark blue colour, and the belly is white. The largest blue sharks can reach lengths of up to 3.8 metres, and weigh as much as 206&nbsp;kg. The shark is found worldwide in [[temperate]] and [[tropical]] waters. They range from the surface to as deep as 350 metres, and prefer water with the temperature of 7 to 16&nbsp;°C. == Description== [[Image:Prionace glauca.jpg|thumb|left|200px|A drawing of a blue shark]] The blue shark has extremely long, pointed [[pectoral fin]]s. The [[dorsal fin]] is moderate in size. It is cl