Clearfin Lionfish

Overview

The Clearfin Lionfish (Pterois radiata) is a distinctive, venomous predator native to the tropical Indo-Pacific region. Often found in rocky reef environments, this species is recognized by its striking reddish-brown body and unique markings that set it apart from other lionfish.

Distribution & Habitat

This species is widely distributed across the Indo-Pacific, ranging from the Red Sea and South Africa to the Society Islands, southern Japan, and New Caledonia. It typically inhabits lagoon and seaward reefs, preferring rocky areas and small caves or crevices where it can hide during the day. While generally found in coastal waters, it may occasionally be seen in surge zones.

Appearance

The Clearfin Lionfish is easily identified by the two horizontal white stripes located on its caudal peduncle, a feature unique among lionfish. Its body is marked with broad, dark reddish-brown vertical bands separated by thin white lines. The species is further distinguished by its long, clear, and unbanded dorsal and pectoral fin spines, which lack the markings found on related species. It also features a prominent, unbranched tentacle above each eye.

Biology & Behavior

Primarily nocturnal, the Clearfin Lionfish remains inactive during the day, often resting under ledges or in dark crevices. It becomes active at dusk to hunt. While it possesses venomous spines used for defense, it relies on its fan-like fins to corner prey before using its large, protractile mouth to suction-feed. It is typically solitary, though individuals are occasionally observed in small groups.