Jordi Chias / Two male Dusky groupers (Epinephelus marginatus) fighting for territory during mating season at 'baixa do meros', a small pinnacle at Formigas islets Protected area, near Santa Maria Island, Azores. F...

Alex Mustard / Nassau grouper (Epinephelus striatus) yawning on a coral reef drop off. San Salvador island, Bahamas. Bahamas Sea, Tropical West Atlantic Ocean.

Alex Mustard / Pederson cleaner shrimp (Periclimenes pedersoni) cleaning the eye of a Nassau grouper (Epinephelus striatus), Bloody Bay Wall, Little Cayman, Cayman Islands. British West Indies, Caribbean Sea.

Juergen Freund / Caretaker transfers live fish in fish pens of Groupers / Coral trout, Live Reef Fish Trade, Tampakan, Kudat Bay, Sabah, Borneo, Malaysia, June 2009.

Georgette Douwma / White banded/ Scarlet cleaner shrimp (Lysmata amboinensis) on Coral hind (Cephalopholis miniata) Rinca, Komodo National Park, Indonesia, October

Tim Laman / Grouper holding pens, destined for the live fish trade to Hong Kong. Raja Ampat Islands, West Papua, Indonesia, May 2007

Georgette Douwma / Coral hind (Cephalopholis miniata) lying in ambush under table coral on reef. Andaman Sea, Thailand.

Jeff Rotman / Close-up of the eye of a Jewel Grouper / Coral hind (Cephalopholis Miniata) Red Sea, Egypt

Jeff Rotman / Jewel Grouper / Coral hind (Cephalopholis Miniata) with mouth open, Red Sea, Egypt

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) with mouth wide open, 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus)with a few fish lice (parasitic copepods) are visible near its nostril, Cala di Grecu, Lavezzi Islands, Corsica, France, September 2008 WWE BOOK.

Wild Wonders of Europe / Pitkin / Dusky grouper (Epinephelus marginatus) 'Merouville' ('grouper City') Lavezzi Islands, Corsica, France, September 2008