Shorefishes of the Tropical Eastern Pacific Online Information System
Updated: 06/12/2008  

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Perciformes  -  Acanthuridae  -  Acanthurus  -  Acanthurus nigricans

Acanthurus nigricans

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white blotch under eye
D & A - black & yellow
C  white



Acanthurus nigricans (Linnaeus, 1758)

Whitecheek surgeonfish,     Goldrimmed surgeonfish

Body an elongate oval; head profile steep; eye high on the head; mouth small, protrusible, low on head;
 teeth on jaws fixed, with flattened, notched tips, 8-28 on each jaw; gill rakers 17-19; dorsal rays IX, 28-31; anal rays III, 26-29; pectoral rays 16; pelvic fin I, 5; a single depressible spine fits into a groove on the side of the base of the tail; tail fin concave; scales very small, rough; lateral line complete.

Black or blue-black; with large white blotch below eye; narrow white band encircling mouth; a yellow band, becoming broader posteriorly, at base of dorsal and anal fins; tail fin white with narrow yellow bar posteriorly.

Size: largest specimen, 22 cm.

Habitat: usually seen in shallow water of exposed coral reefs or rocky shores.

Depth: 0-70 m.

Eastern Indian Ocean and the tropical Pacific, mainly at islands; in the eastern Pacific it is known from the tip of Baja California, the SW and SE Gulf of California, southern Mexico, Costa Rica to Ecuador and all the offshore islands.

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