The common name "surgeonfish" is derived from a characteristic that clearly distinguishes Acanthuridae from other fish families: the spines or "scalpels" on the caudal peduncle, one or more on each side. Based primarily on differences in this characteristic, the family can be divided into three subfamilies: The Acanthurinae, in which the peduncular spine rests in a groove and can be erected in defence during the fights, the Nasinae and Prionurinae in which the peduncular feature is arranged as one or more fixed blades on each side, that are sharp and elongate with age.
Naso - Unicorn
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doktervissen
Naso - Unicorn
Naso brachycentron
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Westelijke Indische Oceaan
Widespread Indo-West Pacific. Deep coastal to outer reef slopes usually in small groups but occasionally in large schools. Adults are identified by their humped back, and only males have the long horn in front of their eyes. Juveniles are plain grey and have a white peduncle. Length to 70m.
