Whitecheek Surgeonfish

Acanthurus nigricans

Whitecheek Surgeonfish (Acanthurus nigricans) is a reef-dwelling surgeonfish of the Indo-Pacific, usually seen singly or in pairs on seaward coral slopes and surge zones. It is primarily an algae grazer and has a sharp tail spine that can inflict painful cuts.

Saltwater

Whitecheek Surgeonfish reference image — Rickard Zerpe, cc-by, via Wikimedia Commons. Source: Wikimedia Commons.

Identification points

Dark bluish-black body with a conspicuous white cheek/face patch below the eye
Yellow pectoral fin and yellowish patch on the rear body near the caudal peduncle
Plain tail fin with the characteristic surgeonfish scalpels on either side of the tail base

Habitat

Outer coral reefs, surge channels, and steep reef slopes with good water movement; adults often hold near drop-offs and rubble-rich reef edges where turf algae grows.

Bait notes

Rarely targeted by anglers; if taken incidentally, it may take small algae-based offerings, nori strips, or tiny pieces of shrimp on light tackle, but it is mainly an aquarium/recreational reef species rather than a gamefish.

Behavior

Browses turf algae and benthic films by day, often keeping to exposed reef faces; can be territorial around feeding areas and may dart into crevices when startled.

Caution

Dorsal/anal area and especially the caudal peduncle carry a sharp scalpel-like spine that can cause deep cuts. Reef-caught surgeonfish are not typical table fare and may pose ciguatera risk depending on location; avoid consumption unless local guidance confirms it is safe.

Fishing notes

Not a standard sportfish. Handle minimally and release quickly if caught; use very light terminal tackle around reef structure to avoid injury to fish and line abrasion from coral.