Michele Westmorland / Schooling fish around healthy reef system, Castle Rock, Komodo National Park, Indonesia.

Alex Mustard / A long exposure renders Bar jacks (Carangoides ruber) as ghostly trails as they swim around a sponge, on a coral reef, at night. East End, Grand Cayman, Cayman Islands. Overall winner of GDT competiti...

David Hall / Pink Anemonefish {Amphiprion perideraion} in tentacles of Magnificent anemone. Philippines

Georgette Douwma / Lyretail anthias / Goldies (Pseudanthias squamipinnis) over coral reef with soft corals (Dendronephthya sp) Egypt, Red Sea.

Alex Mustard / Busy coral reef community feeding on plankton, with Scalefin anthias (Pseudanthias squamipinnis), Soft corals (Dendronephthya sp.) and Fire corals (Millepora dichotoma) Ras Mohammed Marine Park, Sinai...

Francis Abbott / Colourful coral reef scene, Red Sea

Alex Mustard / Red Sea anemonefish (Amphiprion bicinctus) in Magnificent sea anemone (Heteractis magnifica), which has closed up in the late afternoon, on coral reef under stormy seas. St Johns Reef. Egypt. Red Sea.

Juergen Freund / Close-up of fin of Parrotfish, Caribbean

GEORGETTE DOUWMA / Coral hind (grouper) in coral reef, Red Sea

Juergen Freund / Triplefin fish {Helcogramma sp} on Basketstar, Sulu-Sulawesi seas, Indo-pacific

Jeff Rotman / Yellowstriped anthias fish {Anthias tuka} and Giant sea fan Papua New Guinea

Jeff Rotman / Close-up of knife-like marking at base of tail on Eyestripe surgeonfish (Acanthurus dussumieri) Great barrier reef

Juergen Freund / Coral goby {Pleurosicya mossambica} on bubble coral Philippines