Atlantic Blue Tang

Acanthurus coeruleus

Atlantic blue tang (Acanthurus coeruleus) is a bright blue surgeonfish of Atlantic reefs and seagrass edges, most vivid as juveniles and adults in shallow clear water. It grazes mostly on algae and is a common reef species, though details of local abundance vary by area.

Saltwater

Atlantic Blue Tang reference image — Sylfred1977, cc-by-sa, via Wikimedia Commons. Source: Wikimedia Commons.

Identification points

Uniform cobalt-blue body in adults; juveniles are bright yellow.
Deep-bodied oval surgeonfish profile with a narrow caudal peduncle and tail-base spines.
Small mouth and continuous dorsal/anal fins; tail is often paler or yellowish in juveniles and subadults.

Habitat

Shallow coral reefs, reef crests, rocky patch reefs, lagoons, and seagrass beds with abundant algal growth; usually in clear tropical western Atlantic and Caribbean waters, from very shallow to around 30 m.

Bait notes

Not a prime targeted food fish; anglers rarely seek it. If caught by accident, small bits of algae-laden bait, tiny pieces of shrimp, or small reef jigs can draw bites, but it more commonly takes tiny natural scraps while grazing.

Behavior

Diurnal grazer that spends much of the day browsing filamentous algae from rocks and reef surfaces; forms loose schools or small groups, especially juveniles, and retreats into reef structure at night.

Caution

Sharp scalpels at the tail base can cut hands; handle carefully. Local harvest rules may protect reef fishes in some areas, and the species is not typically targeted for consumption.

Fishing notes

Best caught incidentally on ultra-light tackle around reefs. Use small hooks and minimal terminal tackle near structure; gentle presentation matters because they feed by pecking at surfaces rather than chasing large lures.