Steephead Parrotfish

Overview

The Steephead Parrotfish (Chlorurus gibbus) is a large, reef-associated species endemic to the Red Sea and the Gulf of Aqaba. Often found in small groups, these fish are well-known for their role in reef ecosystems, where they graze on algae and contribute to bioerosion by scraping coral surfaces.

Distribution & habitat

This species is restricted to the Red Sea and the Gulf of Aqaba. It typically inhabits shallow coral reefs, lagoons, and nearby sandy substrates at depths ranging from 2 to 30 meters.

Appearance

Adults can reach up to 70 cm in length and develop a distinctive, blunt-headed profile with a prominent hump on the snout. Their coloration varies by sex and age: juveniles are solitary and marked with longitudinal black and white stripes, while adults display a base of blue or gray-green. Males often exhibit a vibrant green and purple sheen, whereas females tend to show a yellow sheen. Large males may also display a brilliant blue streak or patch behind the corner of the mouth.

Biology & behavior

Steephead Parrotfish are diurnal and generally social, often moving in groups as adults. They are known to produce a protective mucus cocoon at night to deter predators. Like other parrotfish, they play a significant role in the environment by consuming benthic algae, which helps maintain reef health, while their feeding process generates sand. They are oviparous and form distinct pairs during spawning. Please note that consumption of this species has been linked to reports of ciguatera poisoning.