Bullethead Parrotfish in Mauritius (Chlorurus sordidus)
The Bullethead Parrotfish, known locally as Poisson perroquet à bosse and scientifically as Chlorurus sordidus, is one of the most frequently observed medium-sized reef fish in Mauritian waters. Growing to around 40 cm in length, it belongs to the family Labridae and is celebrated for its extraordinary colouration, fascinating feeding behaviour, and its remarkable ecological role on coral reefs.
Identification and Appearance
Like many parrotfish, Chlorurus sordidus exhibits dramatic sexual dichromatism — meaning males and females look strikingly different. Initial phase individuals (typically females and some males) display a mottled brownish-grey coloration with pale streaks and spots. In contrast, terminal phase males are a feast for the eyes: their bodies shine with brilliant shades of blue-green and turquoise, accented with pink, orange, and yellow markings around the face and scales. The
FAQ
Where is the best place to see Bullethead Parrotfish in Mauritius?
Bullethead Parrotfish are commonly spotted at many reef dive sites around Mauritius including Coin de Mire, Holt's Rock, and the Blue Bay Marine Park. They tend to congregate in areas with abundant coral growth where they feed actively throughout the day.
Why do parrotfish bite coral and what does this mean for beaches?
Parrotfish like Chlorurus sordidus use their powerful beak-like fused teeth to scrape algae from coral surfaces and sometimes bite off chunks of coral skeleton. After digesting the organic matter, they excrete the calcium carbonate as fine white sand. A single parrotfish can produce hundreds of kilograms of sand per year, meaning much of Mauritius's famous white sand originates from these remarkable fish.
Is the Bullethead Parrotfish dangerous to divers?
Not at all. Bullethead Parrotfish are entirely harmless to divers and snorkelers. They are naturally curious but generally go about their business undisturbed by human presence. The only danger is startling them by swimming too aggressively close, which may cause them to flee.
