Koran Angelfish

The Koran Angelfish is a large, handsome angelfish widespread across Indo-Pacific reefs, named for markings on its juvenile pattern that some early observers likened to Arabic script. Adults show a blue-green to olive body flecked with numerous pearly blue spots and fine curving lines, along with an elongated, trailing extension on the soft dorsal fin that develops with maturity. Juveniles are dramatically different, displaying a dark blue body wrapped in broad, concentric white and pale blue circular bands that gradually break apart and fade as the fish grows into its adult coloration over roughly a year or more. Koran Angelfish are typically found singly or in pairs around reef structure, sponges, and coral, and their striking juvenile pattern makes them popular in the marine aquarium trade.

• Adults: blue-green to olive body with pearly blue spots and lines, elongated trailing tip on the soft dorsal fin
• Juveniles: dark blue body with broad, concentric white and pale blue circular bands
• Face: pale-ringed eye, subtle blue facial markings
• Body shape: deep, disc-shaped, typical large angelfish profile

Juveniles closely resemble juvenile Blue Ring Angelfish (Pomacanthus annularis), but Koran juveniles show broader, more widely spaced concentric bands, while Blue Ring juveniles have tighter, more numerous rings. Adult Koran Angelfish also lack the distinct blue neck-ring of that species, showing an evenly spotted body instead.

Koran Angelfish are found across the Indo-Pacific from East Africa and the Red Sea through Southeast Asia to Australia and the western Pacific, inhabiting coral reefs, lagoons, and adjacent rocky or rubble habitats. They occur from shallow water to depths of around 40 meters, and while adults often favor clearer reef slopes and lagoon edges, juveniles typically shelter in more protected areas such as branching coral thickets, caves, and reef crevices. The species tolerates a range of reef conditions across its broad geographic distribution.

Koran Angelfish feed on a mix of sponges, algae, tunicates, and other invertebrates picked from reef surfaces throughout the day. Adults often form bonded pairs that share a reef territory, while juveniles are typically solitary and secretive, staying close to shelter to avoid aggressive encounters with territorial adults. Like other large angelfish, they are believed to be protogynous hermaphrodites capable of sex change from female to male. The dramatic difference between juvenile and adult coloration is thought to help young fish avoid territorial aggression from adults, since they are not recognized as competitors for space or resources.