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Goldrim Powder Grey


Goldrim Powder Grey
Acanthurus nigricans
Place of origin: 
Central Pacific
Widespread Indo-Pacific, showing no obvious differences throughout its large geographical range. Occurs mainly on outer reef crests in small to large aggregations when adult. Small juveniles are somewhat shy amongst large corals. Best distinguished from the similar Acanthurus japonicus by the relatively small white mark below the eye and sub-marginal yellow band in 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 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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