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- English Name : Yellowfin surgeonfish, Ringtail surgeonfish
- Local Name : Vilu kaalhu
- Size : Max. 65 cm
- Family : ACANTHURIDAE
- Order : Perciformes
- Distinctive Characters: Dorsal fin with 9 spines and 25-27 rays. Anal fin with 3 spines and 23-25 rays. Pectoral rays 16 or 17. Body depth 2.0-2.3 in standard length. Caudal spine 4.5-5.5 in head length. Caudal fin lunate. Gill rakers 16-22.
- Colour: Pale grey; dull yellow around eye; dorsal and anal fins dull yellow with four longitudinal broad blue bands; outer third of pectoral fin yellow; base of caudal fin often dull white.
- Habitat and Biology: Usually observed in deeper lagoons dominated by sand, generally at depths greater than 10 m. Feeds on benthic algae.
- Distribution: Indo-Pacific and Tropical Eastern Pacific.
- Remarks: Acanthurus xanthopterus is perhaps the largest of the surgeonfishes. Occurs in schools and is
very common in deep lagoons (“vilu�?). This species has been previously called as A. matoides.