Richard Robinson / Sulawesi wrasse (Oxycheilinus celebicus ) Yagasa Lagoon, Lau Island Group, Fiji.

Richard Robinson / Sulawesi wrasse (Oxycheilinus celebicus ) Yagasa Lagoon, Lau Island Group, Fiji.

Alex Mustard / Crocodilefish (Cymbacephalus beauforti) close up detail of the retractable eye-lashes, Mabul Island, Sabah, Borneo, Malaysia Celebes Sea

Pascal Kobeh / Sunset on the volcano island of Manado Tua, Manado, Indonesia, Sulawesi Sea

Alex Mustard / Bumphead parrotfish (Bolbometopon muricatum) gather at dawn on a shallow coral reef. Sipadan Island, Sabah, Borneo, Malaysia. Celebes Sea. Vulnerable species.

Alex Mustard / Portrait of a Green sea turtle (Chelonia mydas) in morning light. Sipadan Island, Sabah, Borneo, Malaysia. Celebes Sea.

Alex Mustard / Orange anemonefish (Amphiprion sandaracinos) in its host Mertens' carpet sea anemone (Stichodactyla mertensii). Mabul Island, Sabah, Borneo, Malaysia. Celebes Sea / Sulawesi Sea.

Georgette Douwma / Artificial coral reef site with a Blue starfish (Linckia laevigata) Mabul, Malaysia.

Alex Mustard / Portrait of giant frogfish (Antennarius commerson) Mabul Island, Sabah, Malaysia. Borneo. Celebes Sea.

Alex Mustard / Close up view of Large whip goby (Bryaninops amplus) on gorgonian sea whip. Kapalai Island, Sabah, Borneo, Malaysia. Sulawesi Sea/Celebes Sea.

Mark Moffett / Marauder Ant (Pheidologeton diversus) major worker ant smashes the mid-section of a long centipede caught during a raid, which the smallest minor worker ants have pinned down, Celebes Island, Indonesi...

Alex Mustard / Nudibranch (Chromodoris reticulata) Celebes Sea, Mabul Island, Sabah, Malaysia. Borneo. It was discovered in 2013 that this species has a 'disposable penis', which is shed after mating and regrows in...

Alex Mustard / A Whitetip Reef shark (Triaenodon obesus) resting on the seafloor on a coral reef. Unlike other most sharks this species can breath without swimming by panting as it rests. Sipadan Island, Sabah, Born...

Hiroya Minakuchi / Chevron Barracuda (Sphyraena putnamiae) school, Sipadan Island, Celebes Sea, Borneo, Malaysia

Hiroya Minakuchi / Green Sea Turtle (Chelonia mydas) on coral reef, endangered, Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Bigeye Trevally (Caranx sexfasciatus) school swimming off Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Bigeye Trevally (Caranx sexfasciatus) school swimming off Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Green Sea Turtle (Chelonia mydas) resting beneath ledge on coral reef, endangered, Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Bigeye Trevally (Caranx sexfasciatus) school swimming over coral reef, Sipadan Island, Celebes Sea, Borneo

Hiroya Minakuchi / Staghorn Coral (Acropora cervicornis) in coral reef around Sipadan Island, Celebes Sea, Borneo

Doug Perrine / Beaufort's crocodilefish / crocodile flathead {Cymbacephalus beauforti} juvenile resting on sea bed, Mabul Island, Celebes Sea, Borneo, Malaysia

Doug Perrine / Giant frogfish {Antennarius commerson} camouflaged on yellow sponge, Mabul Island, Sabah, Celebes Sea, Borneo, Malaysia

Doug Perrine / Green turtle {Chelonia mydas} sleeping on coral reef, Celebes Sea, Sipadan Island, Borneo, Malaysia

Doug Perrine / Green turtle {Chelonia mydas} on coral reef, Celebes Sea, Sipadan Island, Borneo, Malaysia

Norbert Wu / Split-view showing swimming school of fish and buildings on beach, Sipadan Island, Borneo, Celebes Sea

Hiroya Minakuchi / Chevron Barracuda (Sphyraena putnamiae) school swimming in spiral, Sipadan Island, Celebes Sea, Borneo, Malaysia

David Fleetham / Green sea turtle (Chelonia mydas) pair mating, with female who tows clinging male through ocean and to the surface to breathe, Sipadan Island, Malaysia, Celebes Sea, Pacific Ocean.

David Fleetham / Green sea turtle (Chelonia mydas), male, mating with female. Two pursuing males biting at his fins in attempt to persuade him to relinquish his position. Sipadan Island, Malaysia, Celebes sea, Pacific...

David Fleetham / Bumphead parrotfish (Bolbometopon muricatum) grinding coral / feeding off Sipadan Island, Malaysia, Celebes Sea, Pacific Ocean.

David Fleetham / Snorkelers swimming over reef on particularly calm glassy day off Sipidan Island, Malaysia. Cebeles Sea, Western Pacific Ocean. Model released

David Fleetham / Pair of Green sea turtles (Chelonia mydas), mating, with two pursuing males, Sipadan Island, Malaysia, Celebes Sea. Endangered.

David Fleetham / Male Gold-specs jawfish (Opistognathus randalli), with mouth brooding eggs, the eyes can clearly be seen in the eggs indicating they will soon hatch, Mabul Island, Sabah, Malaysia, Celebes Sea.

David Fleetham / Yellow boxfish (Ostracion cubicus) with ghost shrimp (Palaemonetes sp.) resting on head, Celebes Sea, Sipidan Island, Malaysia.

David Fleetham / Depressed spindle cowrie (Hiatavolva depressa) inhabits sea whip coral (Alertigorgia sp), Celebes Sea, Mabul Island, Malaysia.

David Fleetham / Minute / Dwarf filefish (Rudarius minutus) just over an inch long as an adult, Celebes Sea, Mabul Island, Malaysia.

David Fleetham / Harlequin / Clown / Many spotted sweetlips fish (Plectorhinchus chaetodonoides) swims in erratic pattern mimicking spanish dancer nudibranch to deter predators, Celebes sea, Mabul Island, Malaysia.

Georgette Douwma / Stony coral (Acropora millepora) Derawan Islands, East Kalimantan, Indonesia. Indo-West Pacific.

Georgette Douwma / Soft coral (Alcyonacea). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Frogspawn coral (Fimbriaphyllia). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Giant clam (Tridacna sp) mantle. Derawan Island, East Kalimantan, Indonesia.

Georgette Douwma / Cardinalfish (Apogon sp) shoal sheltering in Coral branches. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Pyramid butterflyfish (Hemitaurichthys polylepis) in coral reef Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Long-nosed butterflyfish (Forcipiger flavissimus). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Banded longsnout butterflyfish (Chelmon rostratus). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Dark red spined brittlestar (Ophiothrix purpurea) on Coral. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Purple anthias (Pseudanthias tuka) female sheltering in Branching coral. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Squarspot anthias (Pseudanthias pleurotaenia) female. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Pink anemonefish (Amphiprion perideraion). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Green algae (Halimeda sp). Derawan Islands, East Kalimantan, Indoneisa.

Georgette Douwma / Green algae (Chlorophyta), close up. Derawan Islands, East Kalimantan, Indoneisa.

Georgette Douwma / Twotone wrasse (Halichoeres prosopeion) over coral reef. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Delicate tube worm (Filogranella elatensis). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Delicate tube worm (Filogranella elatensis). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Christmas tree worms (Spirobranchus sp). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Christmas tree worms (Spirobranchus sp). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Worm snail (Vermetidae) feeding on plankton and detritis using slime net. Derawan islands, East Kalimantan, Indonesia.

Georgette Douwma / Tropical striped triplefin (Helcogramma striatum) on Pink sea squirts (Didemnidae). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Brown scopas tang (Zebrasoma scopas) with unusual colouration, in coral reef. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Sea squirt (Clavelina sp) group. Derawan Island, East Kalimantan, Indonesia.

Georgette Douwma / Blue-ring sea squirt (Clavelina coerulea). Derawan Island, East Kalimantan, Indonesia.

Georgette Douwma / Blue-ring sea squirt (Clavelina coerulea) clustered around another Sea squirt. Derawan Island, East Kalimantan, Indonesia.

Georgette Douwma / Thorny oyster (Spondylus varius), patterns and colours on mantle caused by Zooxanthellae. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Fire goby (Nemateleotris magnifica). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Translucent coral goby (Bryaninops erythrops) resting on Bubble coral (Plerogyra sinuosa). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Translucent coral goby (Bryaninops erythrops) with parasite under gill, resting on Starfish (Asteroidea). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Flatworm (Pseudoceros sp) in coral reef. Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Acoel flatworm (Waminoa sp) group on Bubble coral (Plerogyra sp). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Reticulated damselfish (Dascyllus reticulatus). Derawen Islands, East Kalimantan, Indonesia.

Georgette Douwma / Crinoid (Crinoidea) on Soft coral (Alcyonacea). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Orangutan crab (Oncinopus sp) resting on Bubble coral (Plerogyra sinuosa). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Soft coral crab (Hoplophrys oatesii) on Soft coral (Alcyonacea). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Soft coral crab (Hoplophrys oatesii) on Soft coral (Alcyonacea). Derawan Islands, East Kalimantan, Indonesia.

Georgette Douwma / Euphyllid coral (Plerogyra sp). Derawan Islands, East Kalimantann, Indonesia.