Doubleband Surgeonfish

Acanthurus tennentii

Habitat & Distribution :  Reef-associated, depths 1 - 40 m, Indo-Pacific Ocean

Diet : Algae and detritus

Size: Up to 31 cm

Lifespan: 8 - 15 years

Description

The doubleband surgeonfish has a characteristic horseshoe-like band on the posterior side of its eye. This is often compared to the mark of a lieutenant, hence its alternative name is known as Lieutenant Tang. Its body coloration highly varies from olive-tan, orange-beige to gray. Like other surgeonfish, it has a scalpel-like spine on its caudal peduncle.

Behavior

Solitary or forming small aggregations. Often seen grazing for algae and detritus during the day, with parrotfishes and other fishes.

Reproduction

Fertilization occurs externally / outside the fish's body. Females will release eggs near the surface, followed by the males' release of their sperm. When fertilization occurs, the egg develops into a planktonic larvae, which means it will drift in the water column for about seven weeks before eventually returning to its reef habitat. The breeding season occurs throughout July to August, with physical preparations beginning in April.

Communication & Perception

Most surgeonfish use visual cues to communicate and sight to look for food, avoid danger and navigate the seafloor.

Predator

Larger predatory bony fishes

Conservation Status: Least Concern (IUCN Red List; 2021)