Halfmoon Triggerfish

The Halfmoon Triggerfish is a robust and hardy species recognized by its dark brown to grayish body contrasted with bright yellow pectoral and caudal fins. A distinctive crescent or halfmoon-shaped marking on the tail gives this species its common name. The body coloration can vary from olive-brown to nearly black depending on mood and environment, while the vivid yellow fins remain a consistent identifying feature.

This is an aggressive triggerfish that thrives in fish-only or fish-only-with-live-rock aquariums. In the wild, it inhabits lagoons and outer reef slopes where it feeds on a variety of benthic invertebrates including crustaceans, sea urchins, mollusks, and worms. It uses its powerful jaws to crush hard-shelled prey and has been observed flipping over rocks and rubble to expose hidden food items. This foraging behavior continues in captivity, where it will rearrange substrate and rockwork.

The Halfmoon Triggerfish adapts exceptionally well to aquarium life and is considered one of the hardier triggerfish species available. It readily accepts all types of prepared and frozen foods and quickly becomes an interactive pet that recognizes its keeper. A 180-gallon aquarium is the minimum recommended size, with robust tankmates that can hold their own against its territorial nature. Despite its aggression toward other fish, it develops a charming personality and is a rewarding species for experienced marine aquarists.