Half-Moon Angel (Pomacanthus asfur) Care Guide
Pomacanthus asfur, the Arabian angelfish, is a Red Sea and Gulf of Aden angel with a bold yellow band that feeds mainly on sponges and tunicates.
Compiled by Aquairi from published sources · Published · Updated
Overview
Pomacanthus asfur, the Arabian or half-moon angelfish, is a marine angel of the family Pomacanthidae. FishBase records a maximum length of about 40.0 cm and notes that the species is common around semi-protected inshore reefs with rich soft and hard coral growth.
Taxonomy
- Family: Pomacanthidae
- Genus: Pomacanthus
- Scientific name: Pomacanthus asfur
Habitat
FishBase reports a Western Indian Ocean range in the Red Sea and Gulf of Aden, south to Zanzibar. It is marine, reef-associated and non-migratory in tropical waters of about 22-27 °C, occurring at depths of about 3-30 m.
Tank requirements
- Minimum tank volume: 1000 L (264 gal)
- Temperature: 24-26 °C (75-79 °F)
- pH: 8.1-8.4
- dKH (carbonate hardness): 8-12
- Lifespan: 15-25 years
Diet
FishBase reports that adults feed mainly on sponges and tunicates, with a trophic level around 2.7. In aquaria a varied diet including sponge-based angelfish foods, marine algae and meaty foods is required, offered in frequent feedings.
Compatibility
This is a large, semi-aggressive angel. FishBase notes it is very aggressive toward its own species unless kept as an established pair. Suitable companions include tangs in large tanks, triggers and large wrasses.
Reef compatibility
Because it feeds mainly on sponges and tunicates, the species is not considered reliably reef-safe and may damage corals, sponges and tunicates. It is best kept in fish-only systems. Maintain specific gravity around 1.024-1.026 and carbonate hardness of 8-12 dKH.
Conservation status
IUCN Red List: Least Concern (assessed 2009), as reported by FishBase.
Half-Moon Angel (Pomacanthus asfur): Breeding Guide
Overview
Pomacanthus asfur, the Arabian or Half-Moon angel, occurs in the Western Indian Ocean in the Red Sea and Gulf of Aden, south to Zanzibar. FishBase lists a maximum total length of about 40 cm and a depth range of roughly 3 to 30 m, common around semi-protected inshore reefs with rich coral growth and occasional silt patches.
Adults feed on sponges and tunicates, so the species is not reef-safe. FishBase notes it is very aggressive toward its own kind unless paired, which is relevant to forming breeding pairs.
Sexing
Males and females are not distinguished by external colour. Given the intraspecific aggression noted above, a bonded pair is normally established slowly by introducing fish young and letting one become the functional male within a large system.
Spawning Behavior & Trigger
The species is oviparous and, like other large Pomacanthus, is expected to spawn as a pair that rises off the reef to release eggs and sperm into the open water column, with external fertilization. Once bonded, a pair can become a stable spawning unit.
Detailed spawning times for P. asfur are not given in the consulted sources; related large angels spawn at dusk, so twilight is the expected trigger.
Egg & Fry Care
The eggs are pelagic and float into the plankton, hatching into minute larvae that depend on micro-plankton far smaller than typical aquarium foods, which is why home rearing is not feasible.
Reef Builders notes that pure asfur has been bred in Asia for many years, producing a variant with a white tail and white bar, and that Bali Aquarich has created asfur hybrids. This places the species firmly in the realm of commercial larviculture rather than home breeding.
Common Challenges
- Strong intraspecific aggression makes pairing unpaired fish risky outside large systems.
- Pelagic eggs and larvae require cultured micro-plankton available only to specialist farms.
- The sponge-and-tunicate diet is hard to satisfy in captivity, limiting broodstock conditioning at home.