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sailfish
Sailfish are a genus ''Istiophorus'' of billfish living in warmer sections of all the oceans of the world. They are predominantly blue to gray in colour and have a characteristic erectile dorsal fin known as a sail, which often stretches the entire length of the back. Another notable characteristic is the elongated bill, resembling that of the swordfish and other marlins. They are therefore described as billfish in sport-fishing circles.
==Species==
Two sailfish species have been recognized.〔McGrouther, M. (2013). ''(Sailfish, Istiophorus platypterus. )'' Australian Museum. Retrieved 26 April 2013.〕 No differences have been found in mtDNA, morphometrics or meristics between the two supposed species and most authorities now only recognized a single species, (''Istiophorus platypterus''), found in warmer oceans around the world.〔〔Gardieff, S: ''(Sailfish. )'' Florida Museum of Natural History. Retrieved 26 April 2013.〕〔Collette, B.B., McDowell, J.R. and Graves, J.E. (2006). ''Phylogeny of Recent billfishes (Xiphioidei).'' Bull. Mar. Sci. 79(3): 455-468.〕 FishBase continues to recognize two species:〔
* Atlantic sailfish (''Istiophorus albicans'').
* Indo-Pacific sailfish (''Istiophorus platypterus'').
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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