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Pinhead pearlfish
The pinhead pearlfish, ''Carapus boraborensis'', is a species of slender, ray-finned fish in the family Carapidae found in the tropical Indo-Pacific Ocean; it normally lives inside the body cavity of a sea cucumber such as the pineapple sea cucumber (''Thelenota ananas'') or the leopard sea cucumber (''Bohadschia argus'').
==Description==
The pinhead pearlfish is a slender, tapering, eel-like fish that can grow to a length of . It has very small eyes and near the jaws are star-shaped melanophores which are more numerous in older specimens. This fish has no scales or pelvic fins, but does have short pectoral fins and an elongated dorsal fin with 31 to 42 soft rays. The equally long anal fin has 45 to 57 soft rays, and ''C. boraborensis'' is the only species in the family to have melanophores on its anal fins. It is a medium brown-coloured fish with a solid body and much enlarged swim bladder that occupies most of its body cavity.〔(【引用サイトリンク】url=http://www.fishbase.org/summary/Carapus-boraborensis.html )〕
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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