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

Fred Bavendam / Banded Reef Cod (Epinephelus fasciatus), Bali, Indonesia

Alex Mustard / Shoal of a Red Sea soldierfish (Myripristis murdjan) and Sixbar grouper (Cephalopholis sexmaculata) shelter in a coral filled cave. Ras Mohammed National Park, Sinai, Egypt. Red Sea.

Pascal Kobeh / Saddle grouper / Sixspot rockcod (Cephalopholis sexmaculata) with White-edged soldierfish (Myripristis murdjan) in a cave, Maldives. Indian Ocean.

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

Alex Mustard / Portrait of cave dwelling Saddled grouper (Cephalopholis sexmaculata) in Ras Mohammed Marine Park. Sinai, Egypt. Red Sea.

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

Juergen Freund / Roving Coral / 6 Banded Grouper (Plectropomus pessuliferus marisburi) on reef, Palawan, Philippines

Fred Bavendam / Banded Reef Cod (Epinephelus fasciatus), Bali, Indonesia