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Atlantic Blue Tang
(Acanthurus coeruleus)

Atlantic, Caribbean, blue, tang, Acanthurus coeruleus, Surgeonfish

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The Atlantic blue tang or Acanthurus coeruleus belongs to the family Acanthuridae. This family encompasses other tang varieties and surgeonfishes. Atlantic blue tang inhabit both the Caribbean and the Gulf of Mexico. Significant populations can also be found along the eastern coastal regions of the Americas from as far north as New York to as far south as Brazil.

There is a species of fish commonly called the Pacific blue tang or royal tang (Paracanthurus hepatus). This species of fish will be addressed in another article.

The Atlantic blue tang is a flat bodied oval shaped fish. Adult and juvenile color palettes are completely different from one another. Juveniles undergo a color morph as a part of adolescence. Juveniles have a bright yellow coloration with blue trimming on the edges of their dorsal and anal fins. Juveniles, in fact, are often referred to as yellow tangs. In the transitional phase between juvenile and adult the fish will develop a blue coloration very typically with yellow trimmed dorsal and anal fins. The caudal fin is generally the last part of the juvenile’s body to undergo the color change. Adults are blue in color. The color gradually grows darker as the fish continues to age. Adults also have horizontal lines on their bodies whereas young tang have no body markings.

The Atlantic blue tang  is also commonly sold under the names Blue Caribbean Tang, Blue Tang Surgeonfish, or simply the Blue Tang. Adults vary in shades from powder blue to a vibrant royal blue. These color variations are often incorporated into their names, for instance the powder blue tang.

Atlantic blues are non-aggressive toward other species. They can be successfully integrated into a community environment without any problems. They will require a couple of hiding places and plenty of swimming room because of their size. These fish do demonstrate territorial behavior and have been known to become combative with other members of their species. It is therefore recommended that you only keep a single adult in a tank. Adults do not tend to exercise aggressive tendencies toward the juveniles of their species. An adult and a juvenile may usually be housed together without incident. Non-confrontational behavior may continue as the young tang matures into adulthood.

Blue tangs are shallow water reef dwellers. They inhabit the coastal coral reefs found along the western Atlantic shorelines. They would be right at home in a reef tank large enough to provide them with adequate swimming room as adults.

These fish are primarily herbivores. In the wild their diet consists of plant matter and algae. But they also demonstrate an occasional taste for small crustaceans. Juveniles will often dine on the parasites commonly found on marine turtles.

In a home aquarium they can be fed plant based marine food. They have also been known to consume meat protein based marine food. The presence of algae in your aquarium will insure that they remain fit and healthy in a captive environment. You may supplement their diet with seaweed.

This fish has little value to the Caribbean fishing industry. They are not caught for human consumption. Ciguaterra poisoning may occur from the consumption of their flesh by human beings. However they are caught for the thriving saltwater aquarium industry and are often used as bait to catch other varieties of fish.

A note of caution: This species has a razor sharp projection at the base of its caudal fin. These retractable, scalpel-like protrusions are a natural means of self defense. They are only exposed when the fish is excited or feels endangered. They will, however,  cut very deeply into human flesh and often result in infections. Infection to the injured area is characterized by swelling and discoloration. This may persist for hours. Because of the infections associated with caudal fin injuries these fish are thought to possess poisonous glands.

Environmental Parameters


pH Level Specific Gravity
72-78  °F 8.1-8-4 1.020-1.025

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