- Bolbometopon muricatum, Green humphead parrotfish
- 1.5 metre(s)
- Not Applicable ()
The world's largest parrotfish is the green humphead parrotfish (Bolbometopon muricatum), a herbivorous species indigenous to coral reefs in the Indian Ocean and Pacific Ocean. The only member of its genus, it measures up to 1.5 metres (4 feet 11 inches) in total length, and weighs up to 75 kilograms (165 pounds 5 ounces), thereby making it considerably larger than any other species of parrotfish. Indeed, it is actually the largest herbivorous species of any fish type that occurs in coral reefs. Males of this species are normally larger than females.
As a juvenile, this very distinctive species has a greenish-brown body patterned with five vertical white spotted bands. As it matures, however, its body's colour changes to bluish-green/grey, its vertical stripes fade, it develops a pinkish-yellow stripe upon the front of its face, and, most conspicuous of all, it develops the large bump-shaped protuberance upon its head from which its common name is derived.