Crescent-tail Bigeye

Overview

The Crescent-tail Bigeye is a widespread, reef-associated fish found throughout the tropical Indo-Pacific. Known for its large, prominent eyes and ability to rapidly shift its coloration, this species is typically encountered in deeper lagoon areas and along outer reef slopes.

Distribution & habitat

This species is found from the Red Sea and southern Africa across the Indo-Pacific to French Polynesia, extending north to southern Japan and south to Australia. It inhabits tropical marine environments, favoring rocky areas, outer reef slopes, and deep lagoon pinnacles.

Appearance

The Crescent-tail Bigeye has a deep, laterally compressed body and a distinctively crescent-shaped or emarginate tail. Its most striking feature is its large, red eyes. While its base coloration is typically bright or dark red, it can rapidly change to a silvery-pink hue, often displaying approximately six reddish vertical bars or large spots along its sides. A small, often indistinct black spot is typically present at the base of the pelvic fins.

Biology & behavior

Primarily nocturnal, this fish is often seen during the day hovering motionless in caves, under ledges, or near coral heads. While it can be found individually, it also forms small aggregations or schools, particularly in oceanic settings. Its large eyes are well-adapted for hunting in low-light conditions.

Feeding

This species is a predator that feeds on a variety of small prey, including crustaceans, small fish, and other small invertebrates.