Balistoides conspicillum (Clown Triggerfish)

Details

Balistoides conspicillum—the clown triggerfish—is a member of the Balistidae and a conspicuousdiurnal benthic predator on tropical Indo‑Pacific reefs. Its trademark pattern combines large white polka dots on a black lower body with a yellow‑brown reticulate “leopard” back. The anterior dorsal spines form a locking “trigger”mechanism; strong incisors crush hard‑shelled prey.

Ecology & Biology

• Diet: sea urchins, molluscs (bivalves/gastropods), crustaceans and polychaetes; also nips at encrusting invertebrates.

• Behaviour: territorial; forages over reef slopes/crests by day and shelters in crevices at night.

• Reproduction: demersal adhesive eggs; nest‑guarding females can be aggressive to intruders.

Identification

• Pattern: black lower body with large white spots; yellow‑brown reticulate/“leopard” pattern dorsally; often a bright yellow snout.

• Dorsal spines: three‑spine trigger complex (first spine locks, second releases).

• Dentition: stout incisors for crushing hard prey and scraping substrates.

Size & Longevity

• Length: commonly 35–45 cm, maximum around ~50 cm.

• Life: roughly 10–15+ years in the wild (estimates vary).

Range & Habitat

Widespread Indo‑Pacific from East Africa/Maldives to Indonesia–Philippines–Micronesia, east to Samoa, north to the Ryukyus and south to the Great Barrier Reef. Typical on outer reef slopes, terraces and crests and lagoon margins at 5–40 m (records to ~75 m).

Conservation & People

• IUCN: Least Concern (LC); locally affected by reef degradation and ornamental collection.

• Safety: nesting or provoked individuals may charge/bite; maintain respectful distance.