Reef Stonefish

Details

The reef stonefish (Synanceia verrucosa) is a member of the Synanceiidae and among themost venomous bony fishes. Master of crypsis, it lies motionless on rubble/sand with13 hollow dorsal spines linked to venom glands for defence, while striking prey by a rapid suction feed.

Ecology & Biology

• Diet: small–medium reef fishes and benthic crustaceans captured via negative‑pressure suction.

• Behaviour: classic ambush predator; mostly sedentary by day, slightly more active at dusk/night.

• Defence: 13 dorsal spines inject venom when depressed by pressure.

Identification

• Warty, lumpy skin with algal encrustations; colours match surroundings (grey/brown/reddish/yellow‑brown).

• Large head and gape; small, high‑set eyes.

• Dorsal XIII with short soft rays; broad pectorals for bottom‑resting.

Size & Longevity

• Length: typically 25–40 cm, up to about ~50 cm.

• Life: at least 5–10+ years (varies regionally).

Range & Habitat

Widespread across the Indo‑Pacific (incl. Red Sea/East Africa to tropical Pacific islands). Occupies shallow reef flats, lagoons and reef fronts on sand–rubble or crevices from 0–30 m.

Conservation & People

• Threats: habitat degradation, coastal pollution and minor bycatch; overall distribution is broad.

• Safety: wear thick‑soled footwear in shallow reef areas; if stung, seek urgent medical care. Hot‑water immersion is commonly used for pain relief under local guidance, and antivenom may be indicated depending on protocols.

IUCN: Least Concern (LC) (check latest assessment).