Eyeline Surgeonfish
Acanthurus nigricauda
Eyeline Surgeonfish (Acanthurus nigricauda) is a western Pacific and eastern Indian Ocean reef surgeonfish best known from clear lagoon and outer-reef habitats. It grazes primarily on benthic algae and is seldom targeted by anglers.
Identification points
- Pale eye-ring or pale streak on the face just behind the eye
- Dark body with a strong contrast between the head/face markings and the trunk
- Sickle-like caudal peduncle spine and oval, laterally compressed surgeonfish body
Habitat
Shallow coral and rocky reefs, reef flats, lagoon edges, and seaward reef slopes with strong water movement; often over hard bottom where turf algae and benthic growth are available.
Bait notes
Not a common game fish. If hooked incidentally, small algae-imitating flies, tiny soft plastics, or bits of fresh seaweed may attract it; very small hooks work better than standard bait rigs.
Behavior
Diurnal grazer that feeds in small schools or loose groups, picking algae from rock and coral surfaces. Like other surgeonfishes, it is quick to dart into cover and can be wary around divers and anglers.
Caution
Sharp scalpels at the base of the tail can slash skin; handle with care. Reef fish can carry ciguatera risk in some areas, so local consumption advisories matter. Check local reef-fish regulations before keeping any.
Fishing notes
Best approached with ultra-light tackle or fly gear near shallow reef structure. Sight-fishing and gentle casts matter; avoid heavy hardware that spooks fish and can damage reef habitat. Many anglers release surgeonfishes immediately.