Threespot Squirrelfish

Overview

The Threespot Squirrelfish (Sargocentron cornutum) is a nocturnal reef-dweller native to the western Pacific Ocean. It is easily recognized by its striking red and silvery-white striped body and distinct dark markings on its fins and tail base.

Distribution & habitat

This species is found throughout the tropical western Pacific, ranging from Indonesia and the Andaman Sea to the Solomon Islands and the Great Barrier Reef. It typically inhabits coral-rich environments, favoring outer reef slopes and steep drop-offs where it can find shelter.

Appearance

The body is moderately deep and compressed, featuring alternating broad, deep-red and narrow, silvery-white horizontal stripes. Key identifying features include a prominent black blotch on the middle of the caudal-fin base, as well as additional dark marks at the bases of the soft dorsal and anal fins. It possesses a sharp, venomous spine on the corner of its preopercle, which serves as a defensive mechanism.

Biology & behavior

As a nocturnal species, the Threespot Squirrelfish remains secretive during the day, hiding within caves, crevices, or beneath coral ledges. It becomes active at night to forage. While generally indifferent to divers, it can be territorial toward other fish, particularly those with similar behaviors, if space is limited. The venomous preopercular spine is not typically lethal to humans but can cause significant pain if handled improperly.

Feeding

This fish is a nocturnal predator that hunts primarily on the seafloor. Its diet consists mainly of benthic invertebrates, specifically crabs and shrimps.