Acanthurus tristis Randall, 1993
Indian Ocean mimic surgeonfish
photo by Randall, J.E.

 Family:  Acanthuridae (Surgeonfishes, tangs, unicornfishes), subfamily: Acanthurinae
 Max. size:  25 cm TL (male/unsexed)
 Environment:  reef-associated; depth range 2 - 30 m
 Distribution:  Indian Ocean: Bay of Bengal (Ref. 8940) and the Andaman Sea west to Maldives and Chagos Archipelago, and east to islands of southern Indonesia at least to Bali.
 Diagnosis:  Dorsal spines (total): 8-8; Dorsal soft rays (total): 23-33; Anal spines: 3-3; Anal soft rays: 22-29. Margin of caudal fin narrow and white. No orange area behind gill opening and extending ventrally behind base of pectoral fins (juveniles mimic the angelfish Centropyge eibli) (Ref 9808). Description: Characterized further by having dark band from chin to upper edge of gill cover; white margin on caudal fin; length of caudal spine 2.5-4.7 in head length; greatest depth of body 1.8-2.0 in SL (Ref. 90102).
 Biology:  Occurs in shallow lagoon and seaward reefs, in areas of mixed coral, rock or sand. Juveniles mimic the cryptic Centropyge eibli (Ref. 9710, 48637).
 IUCN Red List Status:   (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Capuli, Estelita Emily - 13.02.95
 Modified by: Valdestamon, Roxanne Rei - 29.04.13
 Checked by: Froese, Rainer - 31.01.00

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