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Easy to ID by a prominent white bar bisecting a black/grey head and a thin white bar on the base of the tail.
Can be abundant close to shore in rocky areas of the surge zone, where they feed on algae. They are not territorial and will form large schools with Convict Tangs. Grow to 10 inches.
These fish occur only on subtropical Pacific islands well north and south of the equator, a distribution pattern known as antitropical, which is shared by a number of Hawaiian fishes.