Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.

Alex Mustard / Male Bullethead parrotfish (Chlorurus sordidus) displaying in late afternoon. Ras Katy, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Jeff Rotman / Close up of mouth of a Stoplight parrotfish (Sparisoma viride) Bahamas, Caribbean

Jeff Rotman / Bullethead parrotfish (Chlororus sordidus) tail. Red Sea, Egypt

Franco Banfi / Bridled parrotfish (Scarus frenatus) clownish grin reveals its power tools: grinding teeth used to scrape algae from rock, Maldives, Indian Ocean. Highly commended in the Underwater World Category of...

Juergen Freund / Detail of eye of Parrotfish (Scarus rivulatus) Komodo NP, Indonesia

Juergen Freund / Mouth of Parrotfish, Indian Ocean

Shane Gross / Stoplight parrotfish (Sparisoma viride) eating algae on coral reef. Eleuthera, Bahamas.

David Fleetham / Bumphead parrotfish (Bolbometopon muricatum), Yap, Micronesia.

Linda Pitkin / Stoplight parrotfish (Sparisoma viride), male, biting coral rock (feeding on encrusting algae) Bonaire, Leeward Antilles, Caribbean.

Alex Mustard / Bullethead parrotfish (Chlorurus sordidus) male, close up of eye, whilst sleeping at night. The Alternatives, Sinai, Egypt. Red Sea

Georgette Douwma / Greenthroat or Singapore parrotfish (Scarus prasiognathos), terminal male grazing on algae covered coral boulder, Andaman Sea, Thailand. December.