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Naso - Blue Spot


Naso - Blue Spot
Naso vlamingi
Place of origin: 
Western Indian Ocean
Widespread Indo-West Pacific, but some geographical variation. Found on clear coastal to outer reef habitats, forming loose schools along upper regions of deep drop-offs. Readily identified by its colour and in all stages, from juvenile to adults, the lips are blue and  'blue lipped unicorn' would be a more appropriate name. Like most unicorns, it can change colour dramatically and quickly when coming from open water to visit reefs to sleep or when visiting cleaning stations. Length to 55cm. excluding filaments on caudal fin.
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.

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