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Swordfish
Swordfish (''Xiphias gladius''; from Greek ξίφος: sword, and Latin ''gladius'': sword), also known as broadbills in some countries, are large, highly migratory, predatory fish characterized by a long, flat bill. They are a popular sport fish of the billfish category, though elusive. Swordfish are elongated, round-bodied, and lose all teeth and scales by adulthood. These fish are found widely in tropical and temperate parts of the Atlantic, Pacific, and Indian Oceans, and can typically be found from near the surface to a depth of .〔 They commonly reach in length, and the maximum reported is in length and in weight.〔Gardieff, S. ''(Swordfish. )'' Florida Museum of Natural History. Accessed 26 December 2011〕
They are the sole member of their family, Xiphiidae.
== Taxonomy ==
The swordfish is named after its bill resembling a sword (Latin ''gladius'').〔 This makes it superficially similar to other billfish such as marlin, but upon examination, their physiology is quite different and they are members of different families.〔Pepperell, J. 2010. ''Fishes of the Open Ocean: A Natural History and Illustrated Guide.'' ISBN 978-0-226-65539-0〕
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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