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Acanthurus xanthopterus
This fish can grow to around 90 cm in lenght. Its body is purplish gray. It has a region of dull yellow in front of its eye.
It lives near coral reefs in tropical waters of Indo Pacific ocean.
Other name is yellowfin surgeonfish. It is one of several marine fish that change color as they get older. This characteristic confused fish identification, and originally put the young and adults in different species.