Koran Angelfish

Koran Angelfish Pomacanthus semicirculatus

The Koran angelfish, blue angelfish or semicircle angelfish (Pomacanthus Semicirculatus) is a commonly seen fish on coral reefs in East Africa. They range from East Africa to as far south as the rocky shore of Natal in South Africa.

APPEARANCE

Angelfishes are closely related to the butterfly fish. They are distinguished from them by the large spine on the rear of the gill cover. The family obtains its name from the Latin “pom” meaning cover and “acanthus” meaning thorn. One common characteristic that the family has, is that the young are dramatically different in color and pattern to the adults.

As with the other members of Pomacanthus, the Koran angelfish  undergoes a transformation in coloration as it grows. The juvenile has blue, black and white lines that are crescent shaped or almost half circular. If one is observant the curve easily distinguishes it from its similar relatives, Pomacanthus imperator, chrysurus and annularis. These all have similar coloration but different shaped lines.

During the transition from juvenile to adult the lines blur and they resemble arabic writing hence the name Koran Angelfish.

Koran angelfish, blue angelfish or semicircle angelfish (Pomacanthus Semicirculatus)

 

The adult is a pale green-brown color with dark scattered speckles and light crescent markings. The edges of the fish’s body are lined in fluorescent blue. There is also a darker blue outline on the eyelid and gill. Adults grow to thirty five centimeters (13.75″).

Koran Angelfish Pomacanthus semicirculatus

DIET

Koran angelfish feed on small invertebrates, tunicates and slime algae with cynobacteria.

Koran Angelfish Pomacanthus semicirculatus

HABITAT

They are found across the Indo-Pacific, from the east coast of Africa eastwards across the Pacific and have reportedly been found in Hawaii and California.

In South Africa juveniles are often found in rock pools on the shoreline, sometimes even above the neap high water mark. The fish enter and leave these pools with incoming and receding waves.

Koran angelfish, blue angelfish or semicircle angelfish (Pomacanthus Semicirculatus)

 

 

BEHAVIOR

Juvenile Koran angelfish are timid and are often seen swimming upside down or sideways under a ledge or in a cave. Adults are also fairly shy and are almost always seen around coral reefs or rocky areas and will enter  caves if approached. As with the other similar angelfish, they are highly territorial.

PHOTOS

AQUARIUMS

The juveniles are popular with aquarists and are hardy and easy to feed. However they are not ideal for coral or reef tanks as they will nip corals and clam mantles. These fish are happiest in a large tank with live rock and lots of hiding places. In 2011 the University of Florida’s Tropical Aquaculture Lab succeeded in breeding captive specimens for the first time

KORAN ANGELFISH CLASSIFICATION

Kingdom: Animalia
Phylum:   Chordata
Class:       Actinopterygii
Order:     Perciformes
Family:   Pomacanthidae
Genus:    Pomacanthus
Species:  P. semicirculatus

Sources Quoted

Allen, G.R. 1997. Marine Fishes of Tropical Australia and South-east Asia. Western Australian Museum. Pp. 292. – See more at: http://australianmuseum.net.au/blue-angelfish-pomacanthus-semicirculatus#sthash.GNBc8SrR.dpuf

http://australianmuseum.net.au/blue-angelfish-pomacanthus-semicirculatus

Reef Fishes and Corals: East Coast of Southern Africa: Seychelles, Mauritius, Comores, Madagascar & East Africa: Seychelles, Mauritius, Comores, Madagascar and East Africa

Denis King

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