Acanthurus olivaceus, adult, M

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Widespread West to Central Pacific, ranging to sub-tropical zones as juveniles during summer. Coastal reef slopes and inner reefs, usually in small groups on sand and rubble zones. Juveniles in shallow coastal bays in rocky habitats. Adults grey-yellow to almost black, often posterior half abruptly darker, and featuring a bright orange blotch behind eye. Small juveniles bright yellow and blue anal fin margin. Length to 35cm.