Pterois volitans—the red lionfish—is a scorpionfish (family Scorpaenidae) native to theIndo‑West Pacific. It is famous for its fan‑like pectorals and venomous dorsal/anal/pelvic spines. In the western Atlantic–Caribbean–Gulf of Mexico it is a well‑documented invasive species that depresses local small‑reef‑fish populations.
Ecology & Biology
Diet: small fishes and crustaceans; hunts at dusk/night, herding prey with pectorals and striking via suction feeding.
Reproduction: males and females release gelatinous egg masses into the water column; high fecundity aids rapid spread.
Venom: hollow spines on dorsal/anal/pelvic fins deliver venom defensively when compressed.
Identification
Colour/pattern: reddish‑brown to orange with narrow white bars; very elongate fan‑like pectorals.
Spines: typically 13 dorsal spines plus spines on pelvic and anal fins—handle with care.
Juveniles: longer, filamentous pectoral rays; often hover near reef edges and structures.
Size & Longevity
Length: commonly 20–35 cm, up to ~45+ cm.
Life: roughly 5–10 years (region‑dependent).
Range & Habitat
Native: Indo‑West Pacific (Indonesia, Philippines, PNG, N Australia, etc.).Invasive: western Atlantic/Caribbean/Gulf of Mexico. Occurs on reef slopes, artificial reefs, seagrass edges, piers and wrecks from 1–100+ m.
Conservation & People
IUCN: Least Concern (LC) in its native range.
Invasion impacts: reduces native small‑fish abundance/recruitment; targeted removals and edible marketing are used for control.
Safety: avoid bare‑hand handling; if envenomated, local guidance often recommends hot‑water immersion for pain relief and seeking prompt medical care.
