The Red Lionfish (Pterois volitans) is a striking marine species known for its bold stripes, flowing fin rays, and highly effective venomous spines. Native to the Indo-Pacific region, this fish has become a well-studied example of how an introduced species can dramatically influence new ecosystems. In the Atlantic and Caribbean, where it is considered invasive, the red lionfish has rapidly expanded its range due to a lack of natural predators and its exceptional reproductive capacity—females can release tens of thousands of eggs every few days.

Red lionfish are skilled ambush predators. Using their wide pectoral fins like a net, they herd smaller fish and crustaceans before striking with remarkable speed. Their diet includes many species vital to reef health, such as juvenile herbivorous fish that help control algae on coral reefs. This feeding behaviour, combined with their rapid population growth, has raised ecological concerns in affected regions.

Studying the red lionfish helps scientists understand invasion dynamics, reef ecology, and strategies for managing non-native marine species to protect biodiversity.

Swim over to the Tropics Gallery to see this striking species.