Koran Angelfish, Pomacanthus semicirculatus

The Koran angelfish is better known as the semicircle angelfish (pomacanthus semicirulatus). This fish is mainly found in the Indo-Pacific region from the east coast of Africa to the east coast of Fiji and Japan, and from the east coast of Australia to New Caledonia. Since 1999 it has occasionally been seen off the coast of Florida, and since 2005 around Oahu, Hawaii.

The adult semicircle angelfish has a deep body that is laterally compressed and is a pale brownish-green color. The blue base of the scales gives its body a sparkling effect, and can grow to 14 inches in length. The mouth is located just above the snout and the eyes set midway of the long forehead. The pectorals (fins on each side of the body) are pale yellow while all other fins are rimmed in blue along with the cheek, spine and operculum (bony flap covering gills).

The dorsal fin has 13 spines and 20 – 23 soft rays while the anal fin has 3 spines and 18 – 22 soft rays. Both have filaments extending from them while they swim. The pectorals have 19 – 21 soft rays with no spines or filaments.

In contrast, juvenile semicircle angelfish are a bluish-black with narrow white stripes from the top to the bottom of the body. At the head the stripes are straight but as they reach the tip of the tail they increasingly curve. As the young grow they gradually gain the color of the adult when the reach 3.1 to 6.3 inches in length. The young are very timid and difficult to get near.

The semicircle angelfish shelter themselves in coral reefs where they feed on algae, tunicates, and sponges.

Kingdom: Animalia, Phylum: Chordata, Class: Actinopterygii, Order: Perciformes Family: Pomacanthidae, Genus: Pomacanthus

Image Credit: Stan Shebs/Wikipedia (CC BY-SA 3.0, 2.5)