Redtooth Triggerfish

Overview

The Redtooth Triggerfish is a distinctive, reef-associated species widely distributed across the tropical Indo-Pacific. Unlike many of its relatives, this fish is frequently observed in large, active schools, often hovering in current-swept areas along seaward reef slopes.

Distribution & habitat

This species is found throughout the Indo-Pacific, ranging from the Red Sea and East Africa to the Marquesas and Society Islands, and extending north to southern Japan and south to the Great Barrier Reef. It typically inhabits reef channels and slopes where strong currents provide a steady supply of food. While they spend much of their time in open water, they retreat to reef crevices or rubble patches for shelter at night or when threatened.

Appearance

The Redtooth Triggerfish is easily recognized by its deep, laterally compressed body and lunate, lyre-shaped tail. Its coloration is highly variable, shifting between dark blue, purple, and greenish-blue depending on lighting and social context, often appearing nearly black in dim conditions. It is named for its prominent, needle-sharp red teeth, with two upper teeth visible even when the mouth is closed.

Biology & behavior

This species is a gregarious, diurnal fish known for its exceptional swimming ability in strong currents. It possesses a specialized dorsal spine that can be locked into an upright position, allowing the fish to wedge itself securely into rock crevices to avoid predators. While generally more peaceful than other triggerfish, it can exhibit territorial behavior.

Feeding

Primarily a planktivore, it feeds on zooplankton drifting in the water column. Its diet also includes sponges and, occasionally, small invertebrates.