Great Barrier Reef Australia Marine Life

A robust parrotfish with a steep forehead and powerful beak used to scrape algae and coral; important for reef bioerosion and sand production. On the GBR adults are common on reef slopes and fore-reef where they graze hard substrates; large schools are often seen at dusk moving to sleeping sites.

Look for a thick-bodied fish with a steep, rounded forehead and strong beak-like teeth. Males often have brighter blues and greens on the head and tail; observe feeding on hard substrate and the characteristic scraping behavior.

Common Confusions

• Bumphead Parrotfish Bolbometopon muricatum Bumpheads are much larger with a pronounced forehead hump and different head profile; they form big schools and create conspicuous bite scars.
• Two-tone Parrotfish Scarus niger Scarus species often show distinct male/female color phases and lack the steep head profile of Chlorurus.
• Bridled Parrotfish Scarus frenatus Bridled parrotfish have a slenderer body and distinctive bridling stripe through the eye; colors and head shape differ.
• Castelnau's Parrotfish Calotomus japonicus Calotomus is smaller with a squarer head and different dentition visible at close range.
• Rainbow Parrotfish Cetoscarus bicolor Cetoscarus shows dramatic color changes between phases and lacks a steep forehead; overall coloration patterns differ markedly.