White-Spine Surgeonfish

Acanthurus leucocheilus

The White-spine Surgeonfish is a marine ray-finned fish native to the Indo-Pacific region. It is characterized by a dark body, either brown or blackish, with light-colored lips and a white band that stretches across its throat. A key feature is the white spine located on the caudal peduncle, encircled by a white bar. The dorsal fin consists of 9 spines and 24 or 25 soft rays, while the anal fin contains 3 spines and 23 soft rays. Juveniles differ from adults by having a brown body and a yellow tail. This species can reach a length of up to 45 cm. The White-spine Surgeonfish is typically found in clear waters of seaward reefs, often near steep drop-offs. It inhabits depths from 3 to 30 meters, with occurrences as deep as 40 meters. Its range extends from the eastern coast of Africa to the Line Islands in the Indo-Pacific. The species primarily feeds on sand and detritus and is usually observed in small groups, although solitary individuals can also be seen. Divers might spot the White-spine Surgeonfish in small groups or alone. It poses no threat to humans and is listed as Least Concern by the IUCN. The species holds commercial value for both fisheries and the aquarium trade.