Addis Butterflyfish

Addis Butterflyfish

The Addis Butterflyfish (Chaetodon semilarvatus) — also called the golden or bluecheek butterflyfish — is a glowing, disc-shaped Red Sea beauty. Its rich golden-yellow body is crossed by fine orange bars and set off by a smoky blue patch over each eye, making it one of the most instantly appealing butterflyfish in the hobby. Unusually for the family, it is both relatively hardy and notably peaceful, often seen resting quietly among coral by day.

While many butterflyfish are difficult, obligate coral-feeders, the Addis is among the more adaptable, which has made it a long-standing favourite for large fish-only and carefully chosen reef systems.

Natural Habitat & Origin

Chaetodon semilarvatus is native to the north-western Indian Ocean — the Red Sea and Gulf of Aden, east to the coast of Oman — where it inhabits coral-rich areas at depths of roughly 1 to 20 metres (3–66 feet). It is strongly pair-bonding, one of the few fish recorded forming long-term mates, and is frequently seen in pairs or small groups sheltering beneath table corals.

In the aquarium it appreciates plenty of live rock and overhangs to rest under, along with the calm of a peaceful community.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Reaching up to about 23 cm (9 inches) — though often nearer 15 cm — it is a substantial fish that needs a roomy tank of around 340 litres (about 90 US gallons) or more, ideally with space to keep a bonded pair.

A mature system with good water quality and ample rockwork suits it well; it is hardier than most butterflyfish but still rewards stable conditions.

Diet & Feeding

The Addis Butterflyfish is an omnivore, feeding in the wild on coral polyps and benthic invertebrates. In captivity it usually adapts well to prepared foods: offer a varied diet of frozen mysis and brine shrimp, marine angel/butterfly preparations, and foods with marine algae content. Feed several small meals a day, and provide enough variety to keep this active feeder in good condition.

Behavior & Temperament

This is a peaceful, even shy fish that mixes well in a calm community and is happiest kept singly or as a bonded pair. It rarely troubles other fish, and pairs spend much of their time together among the rockwork. Avoid housing it with aggressive species that will outcompete it or keep it hidden.

Tank Mates

Good companions are other peaceful marine fish — tangs, peaceful wrasses, anthias, cardinalfish and similar. Keep it away from boisterous or territorial bullies. In a reef it should be treated with caution: although among the more coral-tolerant butterflyfish, it may still nip at coral polyps and some invertebrates, so it is safest in fish-only systems or reefs with hardy, expendable corals.

Breeding

Chaetodon semilarvatus forms strong pairs but is a pelagic spawner with planktonic larvae, and is not bred in the home aquarium. Trade specimens are wild-collected, predominantly from the Red Sea.

Common Health Issues

The Addis Butterflyfish is hardy by butterflyfish standards but, like all marine fish, is susceptible to marine ich (Cryptocaryon irritans) and marine velvet (Amyloodinium ocellatum), particularly when stressed or newly imported. Quarantine new arrivals, keep water quality stable, and choose a feeding specimen. Given a peaceful tank, a roomy aquarium and a varied diet — ideally as a bonded pair — it is one of the most rewarding and approachable butterflyfish available.