Powderblue Surgeonfish (Acanthurus leucosternon)

This fish is found in shallow, clear coastal and island coral reefs of the Indian Ocean from eastern Africa to the Andaman Sea. It is also seen in southwest Indonesia and Christmas Island. It likes to hang out around reef flats and along upper seaward slopes. They may occur singly or in large feeding aggregations. Its diet is composed mainly of benthic algae but will also feed on small, sparsely scattered algae and small growths in crevices.

Surgeonfish are usually colorful, thin bodied, and have an oval shape. These fish have long continuous dorsal and anal fins and crescent tailfins. The scalpel at the base of their tailfin is very sharp and is used by the fish for protection from predators as well as a way of establishing itself with other fish. These fish are usually seen along reefs grazing on algae throughout the day.