Acanthurus triostegus, L

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Widespread Indo-Pacific, but several geographical variations. Coastal reefs and estuaries. Sometimes form large schools in harbours or to feed in areas with aggressive damselfishes, which are then completely overwhelmed by their numbers. Often feeding near freshwater run-offs where certain algae grows on rocks that are grazed. Readily identified by the pale colour and distinctive pattern of vertical black bars. The black mark in front of the pectoral fin-base is variable from a spot or short dash in most populations, but forms a line in the Hawaiian form. Latter is regarded as subspecies Acanthurus triostegus  sandvicensis  by some authors. Length to 26cm.