Alex Mustard / Portrait of Blacktip grouper (Epinephelus fasciatus) resting in Barrel sponge (Xestospongia testudinaria) Mabul Island, Sabah, Borneo, Malaysia. Sulawesi Sea.

Alex Mustard / Coral grouper (Cephalopholis miniata) waits in ambush, hiding against a seafan (Annella sp.) hunting silversides (Atherinidae), with schooling bigeye snapper (Lutjanus lutjanus) behind. Misool, Raja A...

Georgette Douwma / Elongate surgeonfish (Acanthurus mata) at a cleaning station with Diana wrasses (Bodianus diana). Indonesia.

Michael Pitts / Orange-striped triggerfish (Balistapus undulatus) and Sixspot groupers (Cephalopholis sexmaculata) on a sunken shipwreck, Maldives, Indian Ocean.

Georgette Douwma / Blacktip grouper (Epinephelus fasciatus) Egypt, Red Sea.

Juergen Freund / Pair of Coral trout / Leopard coral groupers (Plectropomus leopardus) performing mating behaviour. Misool, Raja Ampat, West Papua, Indonesia, January

Chris Newbert / Coral Grouper (Cephalopholis miniata) the white stripe tells that it is almost fully grown, the stripe will disappear when it reaches maturity, 50 feet deep, Papua New Guinea

Chris Newbert / Grouper (Cephalopholis sp) and Red Sea Bannerfish (Heniochus intermedius), Red Sea, Egypt

Norbert Wu / Nassau Grouper (Epinephelus striatus) portrait underwater, Hol Chan Marine Reserve, Belize

Juergen Freund / Close up of Nassau grouper eye {Epinephelus striatus} Caribbean