Emperor Angelfish care guide
Emperor Angelfish (Pomacanthus imperator) — minimum tank 750 L, temperature 24-27 °C, pH 8.1-8.4.
Overview
The Emperor Angelfish (Pomacanthus imperator) is a large marine angelfish reaching about 40 cm. Adults are unmistakable, with horizontal blue and yellow stripes, a black mask through the eye and a yellow caudal fin. Juveniles are dark blue with concentric white rings — a dramatically different pattern.
Taxonomy
- Family: Pomacanthidae
- Genus: Pomacanthus
- Scientific name: Pomacanthus imperator
- Common synonyms: Imperator Angelfish
Habitat
Widely distributed across the tropical Indo-Pacific, from the Red Sea and East Africa eastwards to Hawaii and French Polynesia. The species inhabits clear coral-rich outer reef slopes and reef channels from 1 to 100 m depth, with adults sheltering near caves and overhangs.
Tank requirements
- Minimum tank volume: 750 L (198.1 US gal)
- Adult size: 25-40 cm
- Temperature: 24-27 °C (75-81 °F)
- pH: 8.1-8.4
- GH: 8-12 °dGH
- Water flow: moderate
- Lifespan: 10-20 years
- Salinity: SG 1.024-1.026
- Carbonate hardness (dKH): 8-12
Diet
An omnivore that grazes on sponges, tunicates, filamentous algae and detritus in the wild. In aquaria a varied diet is essential — sponge-based angelfish formulas, mysis, krill, enriched brine shrimp and dried algae. Specimens accepting prepared food readily are usually long-lived.
Compatibility
Territorial and intolerant of conspecifics; only one per tank as a rule. Compatible with similarly robust marine fish — large tangs, groupers, triggers and other large angels of different genera in a very large system (4 m+ tanks recommended in zoos).
Reef compatibility
Not reef-safe. Adults routinely sample sponges, tunicates, LPS polyps, soft corals and zoanthids. Suitable only for fish-only with live rock (FOWLR) systems, not for stony-coral reef displays.
Breeding
A pelagic broadcast spawner forming temporary pairs at dusk. Captive breeding has been achieved only in research facilities; almost all aquarium-trade specimens are wild-caught and benefit from quarantine for parasites.
Conservation status
IUCN Red List: Least Concern. Despite heavy demand from the marine ornamental trade the species remains widespread; collection is managed locally in some jurisdictions.