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Naso - Unicorn Blue


Naso - Unicorn Blue
Naso brevirostris
Place of origin: 
Western Indian Ocean
Widespread Indo-West Pacific. Various coastal to outer reef habitats. Common species usually in small groups but form large schools in oceanic locations or along reefs subject to strong currents. Identified by a long horn even when fish is relatively small. Caudal fin bluish grey to white and body and head spotted, with spots forming lines in adults. Length to 50cm.
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 spineĀ  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.

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