Georgette Douwma / Mantel of Spiny oyster (Spondylus varius). Indonesia. Indo-West Pacific.

Tony Wu / Indo-Pacific sailfish (Istiophorus platypterus) in feeding frenzy, with the remains of a previously large school of sardines (Sardina sp) in background. Isla Mujeres, Cancun, Mexico.

Pete Oxford / Whale Shark (Rhincodon typus) feeding at Bagan (floating fishing platform), Cenderawasih Bay, West Papua, Indonesia. Winner of the Man and Nature Portfolio Award in the Terre Sauvage Nature Images Aw...

Pete Oxford / Whale Shark (Rhincodon typus) and Golden trevally (Gnathanodon speciosus) Cenderawasih Bay, West Papua, Indonesia.

Pete Oxford / Whale Shark (Rhincodon typus) with scuba diver, Cenderawasih Bay, West Papua, Indonesia.

Pete Oxford / Whale shark (Rhincodon typus) front view portrait, Cenderawasih Bay, West Papua. Indonesia.

Pete Oxford / Whale Shark (Rhincodon typus) close up of spotted skin, with Golden trevally (Gnathanodon speciosus) Cenderawasih Bay, West Papua, Indonesia.

Pete Oxford / Whale shark (Rhincodon typus) and scuba divers seen from below, Cenderawasih Bay, West Papua. Indonesia.

Pete Oxford / Whale shark (Rhincodon typus) and scuba divers seen from below, Cenderawasih Bay, West Papua. Indonesia. Winner of the Man and Nature Portfolio Award in the Terre Sauvage Nature Images Awards Competit...

Pete Oxford / Whale shark (Rhincodon typus) Cenderawasih Bay, West Papua. Indonesia.

Alex Mustard / Nudibranchs (Doto greenamyeri) newly described species on feather hydroids. Seraya Bay, north coast of Bali, Indonesia. Java Sea.

Alex Mustard / Western clownfish (Amphiprion oceallaris) in a Magnificent sea anemone (Heteractis magnifica). Yillet Kecil, MIsool, Raja Ampat, West Papua, Indonesia. Ceram Sea

Alex Mustard / RF- Western clownfish (Amphiprion oceallaris) in Magnificent sea anemone (Heteractis magnifica). Raja Ampat, West Papua, Indonesia. (This image may be licensed either as rights managed or royalty free...

Alex Mustard / Red and black anemonefish (Amphiprion melanopus) in a Bulb tentacle sea anemone (Entacmaea quadricolor). Kri Island, Raja Ampat, West Papua, Indonesia, South East Asia. Dampier Strait, Tropical West P...

Georgette Douwma / Chocolate chip sea star o (Protoreaster nodosus) on sandy bottom. Mabul, Malaysia.

Georgette Douwma / Upside down jellyfish (Cassiopeia andromeda) Lembeh, Sulawesi, Indonesia.

Jurgen Freund / Gorgonian fan coral (Gorgonaceae) in the shallow mangroves, split level. North Raja Ampat, West Papua, Indonesia. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards Competit...

Jurgen Freund / Schooling silversides (Atheriniformes) split level with karst limestone cliff and West Papuan fishermen in their dugout outrigger canoe. Raja Ampat, Indonesia. Second Place in the Portfolio Award of t...

Jurgen Freund / Mud crab (Scylla serrata) in shallow sandy water. Split level with island and thatched house on stilts. Moromahu Island, Wakatobi, South Sulawesi, Indonesia. Second Place in the Portfolio Award of the...

Jurgen Freund / Man moving Grouper fish between fish pens, Tampakan, Kudat, Sabah, Borneo. June 2009. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards Competition 2015.

Jurgen Freund / Whale shark (Rhincodon typus) split level view, Cenderawasih Bay, West Papua, Indonesia. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards Competition 2015.

Georgette Douwma / Blue triggerfish (Pseudobalistes fuscus). Egypt, Red Sea. Indo-Pacific.

Georgette Douwma / Blue starfish (Linckia laevigata) Malaysia.

Brandon Cole / Bluestriped fangblenny (Plagiotremus rhynorhynchus) in hole, Indonesia, tropical Pacific Ocean.

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Granulated sea star (Choriaster granulatus) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Cock's comb oyster (Lopha cristagalli) covered with encrusting sponge on artificial reef. Mabul, Malaysia.

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Jurgen Freund / Bigfin reef squid (Sepioteuthis lessoniana) blurred motion photograph, Kimbe Bay, West New Britain, Papua New Guinea.

Jurgen Freund / Banded sea kraits (Laticauda colubrina) around the roots of mangrove tree, split level. Mali Island, Macuata Province, Fiji, South Pacific.

Jurgen Freund / Split level of large Purple crown jellyfish (Netrostoma setouchina) in shallows of mangroves. Mali Island, Macuata Province, Fiji, South Pacific.

Jurgen Freund / Green turtle (Chelonia mydas) hatchling swimming to the sea still in the shallows of the beach. Anano Island, Wakatobi, South Sulawesi, Indonesia

Jurgen Freund / Giant clam (Tridacna gigas) Raja Ampat, West Papua, Indonesia.

Pascal Kobeh / Divers are setting up concrete reef balls to build an artificial reef, Philippines, Sulu Sea. August 2014.

Constantinos Petrinos / Chromodorid nudibranch (Chromodoris annae) on Sea Squirt (Polycarpa aurata) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Yellow stripe clingfish (Diademichthys lineatus) living in association with the Fire Urchin (Astropyga radiata) Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Peacock-tail anemone shrimp (Periclimenes brevicarpalis) living commensally with the Branching Sea Anemone (Actinodendron glomeratum). Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Purple short tentacle mushroom coral (Fungia sp.) close up of polyps. Lembeh Strait, North Sulawesi, Indonesia.

Constantinos Petrinos / Bigfin reef squid (Sepioteuthis lessoniana) schooling parallel to one another. Lembeh Strait, North Sulawesi, Indonesia.

Alex Mustard / Eyes of Margined sole fish (Brachirus heterolapis) on its camouflaged body. Saonek Island, Raja Ampat, West Papua, Indonesia. Tropical West Pacific Ocean. Dampier Strait.

Alex Mustard / Reticulate stargazer (Uranoscopus sp.) emerging from the sand. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) hitchhiking on large t-bar nudibranch (Ceratosoma trilobatum) The shrimp gains food source and protection on the toxic seaslug. Bitung, North...

Alex Mustard / Close up of tiny (10mm) Pygmy seahorse (Hippocampus bargibanti) living disguised in Muricella sp. sea fan. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Chris & Monique Fallows / Indo Pacific Sailfish (Istiophorus platypterus) feeding on sardines (Sardina pilchardus), Isla Mujeres, Mexico, March.

Ingo Arndt / Fan Coral (Echinogorgia sp) from Indo-Pacific, in collection at Senckenberg Museum, Frankfurt, Germany.

Chris & Monique Fallows / Indo Pacific Sailfish (Istiophorus platypterus) feeding on sardines, Isla Mujeres, Mexico.

Chris & Monique Fallows / Indo Pacific Sailfish (Istiophorus platypterus) feeding on sardines, Isla Mujeres, Mexico.