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Doctorfish tang
''Acanthurus chirurgus'', commonly called doctorfish or doctorfish tang in English and ''barbero rayado'' or ''cirujano rayado'' in Spanish, is a tropical marine fish common in the Atlantic Ocean.
==Description==
Reaching a maximum size of 39 cm and 5.1 kg, ''Acanthurus chirurgus'' gets its common name for the structures called "scalpels", which are found on either side of the caudal peduncle. The "scalpel" is used during fights with other doctorfish and as a defense mechanism against predators. Its coloration generally varies from blue-gray to dark brown. 10 to 12 vertical bars are always present, but often faint. The edges of the caudal, dorsal, and anal fins are blue. There is also a faint blue ring that can be seen encircling the "scalpel" on either side.
There is a black morph, as well, but it is neither a subspecies nor a regional mutation. It has only been documented a limited number of times.
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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