A typical school of the surgeon fish, Acanthurus olivaceus, grazing on algae during the time when filamentous algae were abundant. This period occurred soon after placement of the pipes and the red and green filamentous algae were replace with blue-green algae at a later stage.
Photo Category: Coral Reefs - Artificial Reef - Vertebrates Fish
Photo Location: Pokai Bay, Oahu
Photo Date: April 1968