Acanthurus coeruleus, commonly known as the Blue Tang, is a vibrant fish species found in tropical Atlantic coral reefs. It exhibits a striking deep blue coloration, with a distinctive yellow tail. They are herbivorous, feeding primarily on algae, and play a crucial role in maintaining reef health.

Acanthurus coeruleus, commonly known as the Blue Tang or Atlantic Blue Tang, is native to the western Atlantic Ocean. Its geographical distribution includes the waters of the Caribbean Sea, the Gulf of Mexico, and the eastern coast of the United States, ranging from New York down to Brazil. This species is particularly abundant around coral reefs in the Caribbean islands and the Florida Keys.

The Blue Tang typically inhabits coral reefs, rocky reefs, and coastal areas with rich coral growth. It thrives in warm tropical and subtropical waters, generally at depths ranging from 2 to 40 meters. The water temperatures in these habitats are usually between 24°C and 28°C (75°F to 82°F), with clear, saline conditions that support coral growth.

Acanthurus coeruleus plays a significant role in the reef ecosystem as a herbivore. It primarily feeds on algae, which helps control algae growth on coral reefs, thus maintaining the balance of the ecosystem. The species has a laterally compressed body adapted for maneuvering through narrow reef spaces and a sharp spine at the base of the tail for defense against predators. Juveniles often inhabit shallow, protected areas like seagrass beds and tide pools, while adults are more commonly found on the reef proper.