Alex Mustard / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) swimming over Seagrass (Halophila stipulacea) meadow. Marsa Nabaa, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Whale shark (Rhincodon typus) close to the camera with a golden trevally fish (Gnathanodon speciosus) and outline of another whale shark behind , in the plankton-rich green waters of La Paz bay, Baja...

Shane Gross / Almaco jack (Seriola rivoliana) uses a discarded fishing net, drifting in the open ocean as shelter. The Bahamas.

Nick Hawkins / Blue shark (Prionace glauca) with a pair of pilot fish (Naucrates ductor) off Halifax, Nova Scotia, Canada. July.

David Fleetham / California yellowtail (Seriola lalandi dorsalis) Guadalupe Island, Mexico.

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Ralph Pace / Silky Shark (Carcharhinus falciformis), Galapagos Shark (Carcharhinus galapagensis), Dusky Shark (Carcharhinus obscurus), and Black-tip Shark (Carcharhinus limbatus) group working with Yellowfin Tuna...

Jordi Chias / Blue spotted trevally (Caranx bucculentus) hunting small fish in the reef, South Ari Atoll, Maldives, Indian Ocean.

Jordi Chias / European barracuda (Sphyraena sphyraena) and Bluefish (Pomatomus saltatrix) circling baitball of Atlantic horse mackerel (Trachurus trachurus) Formigas Islets, Azores. Finalist in the Underwater Categ...

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) female at night with Bar jacks (Caranx ruber), South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream, West Atlantic Ocean.

Alex Mustard / Great hammerhead shark (Sphyrna mokarran) swimming over a sandy seabed, accompanied by Rainbow runners (Elagatis bipinnulata) South Bimini, Bahamas. The Bahamas National Shark Sanctuary. Gulf Stream,...

Jordi Chias / Mobula / Chilean devil ray (Mobula tarapacana) with remora (Remora brachyptera) and Amberjacks (Serila dumerilli) Santa Maria Island, Azores, Atlantic Ocean

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

Norbert Wu / Garibaldi (Hypsypops rubicundus) and Pacific Jack Mackerel (Trachurus symmetricus) school in Giant Kelp (Macrocystis pyrifera) forest, Catalina Island, California

Norbert Wu / Garibaldi (Hypsypops rubicundus) and Pacific Jack Mackerel (Trachurus symmetricus) school in Giant Kelp (Macrocystis pyrifera) forest, Catalina Island, California

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

Alex Mustard / Group of predators hunting together, in an example of 'Nuclear foraging'. The Moray eel (Gymnothorax javanicus) flushes out prey, and is followed by a Napolean wrasse (Cheilinus undulatus) and a Bluef...

Doug Perrine / Barjacks (Caranx ruber), Yellowtail snapper (Ocyurus chrysurus), and Sergeant major damselfish (Abudefduf saxatilis) swimming around wreck of bow gun on C-58 shipwreck off Puerto Morelos, near Cancun,...

Alex Mustard / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by pilotfish (Naucrates ductor) as it cruises beneath the surface of the Red Sea, close to Little Brother Island. The Brothers Islands, Egy...

Aflo / Northern sea nettle (Chrysaora Melanaster) floating, with Mackerel fry ( Carangidae) Izu, Japan. January.

Alex Mustard / Shoal of Bar jacks (Caranx ruber) hunting school of Silversides fish (Atherinidae) in coral cavern. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Pair of Bar jacks (Caranx ruber) hunting Silversides (Atherinidae) inside cave. Devil's Grotto, George Town, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Doug Perrine / Scuba diver films bait ball of Bigeye scad (Selar crumenopthalmus) Keauhou Bay, Kona, Hawaii, Hawaiian Islands. Central Pacific ocean. March 2010. Model released.

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...

Franco Banfi,Franco Banfi / Local man looking down at shoal of Bigeye scad (Selar crumenophthalmus) Waigeo island, Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Sue Daly / Koheru (Decapterus koheru) shoal swiming around diver, Cavalli Islands, New Zealand, February 2013. Model released.

Norbert Wu / Oceanic White-tip Shark (Carcharhinus longimanus) with Pilot Fish (Naucrates ductor), Bahamas, Caribbean

Juergen Freund / School of Yellow line / Yellowstripe scads (Selaroides leptolepis) Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / School of Yellow line scads (Selaroides leptolepis) and diver, Misool, Raja Ampat, West Papua, Indonesia, January 2010. Model released.

Juergen Freund / School of Yellow line scads (Selaroides leptolepis) Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / School of Yellow line scads (Selaroides leptolepis) Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / School of Yellow line scads (Selaroides leptolepis) hunted by Bluefin jacks (Caranx melampygus). Misool, Raja Ampat, West Papua, Indonesia,

Juergen Freund / School of Yellow line scads (Selaroides leptolepis). Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / School of yellow line scads (Selaroides leptolepis) Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Snorkeler swimming through a school of Oxeye scads (Selar boops) in the house reef of Miniloc Island Resort, El Nido island, Palawan, Philippines, May 2009. Model released.

Fred Bavendam / Whale Shark (Rhincodon typus) with Golden Trevally (Gnathanodon speciosus) group swimming in front of its mouth, Exmouth, Australia

Richard Herrmann / California Yellowtail (Seriola lalandi) pair, San Diego, California

Pete Oxford / Diver follows shoal of Steel pompano (Trachinotus stilbe) off Wolf Island, Galapagos Islands, Model released

Pete Oxford / Steel pompano fish (Trachinotus stilbe) cleaning Galapagos green turtle (Chelonia mydas agassizi) off Wolf Island, Galapagos Islands

Tim Laman / Lookdown fish (Selene vomer), captive. Nassau, New Providence Island, Bahamas.

Juergen Freund / Leatherjacket / Skip Jack (Oligoplites saurus) and shoal of small fish around pilons beneath the 2km long Busselton Jetty. Busselton, Western Australia

Chris Newbert / Bigeye Trevally (Caranx sexfasciatus) school, 40 feet deep, Solomon Islands

David Shale / Trevally {Selene vomer} pelagic juvenile, West Atlantic.

Flip Nicklin / Cavalla (Caranx sp) school off of Cocos Island, Costa Rica

Flip Nicklin / Pompano (Trachinotus sp) juvenile off of Manualita Island on the west side of Cocos Island, Costa Rica

Chris Newbert / Bigeye Trevally (Caranx sexfasciatus) schooling, 30 feet deep, Solomon Islands

Chris Newbert / Bigeye Trevally (Caranx sexfasciatus) school, 40 feet deep, Solomon Islands

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Norbert Wu / Bigeye Trevally (Caranx sexfasciatus) school form a moving circle, Borneo

Fred Bavendam / Bigeye Trevally (Caranx sexfasciatus) school with diver, Bali, Indonesia

Alex Mustard / Black and white photo of school of Bigeye trevally (Caranx sexfasciatus) form a circular shoal in open water, on the drop off of a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea. Highly...

Alex Mustard / African pompano (Alectis ciliaris) juvenile with long trailing dorsal and anal fins, swimming in mid-water at night. In-camera double exposure. Anilao, Batangas marine protected area, Luzon, Philippin...

Alex Mustard / Bar jack (Caranx ruber) hunting a school of silversides (Atherinidae) in a coral cavern. George Town, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / RF - A school of adult Giant trevally (Caranx ignobilis) swimming near a coral reef. Red Sea

Sergio Hanquet / Ocean sunfish (Mola mola) and Pilot fish (Naucrates sp). Tenerife, Canary Islands.

Sergio Hanquet / Ocean sunfish (Mola mola) and Pilot fish (Naucrates sp). Tenerife, Canary Islands.

Sergio Hanquet / Ocean sunfich (Mola mola) at sea with pilot fish. Sp: Pez Luna, Pejeluna - fr: Poisson lune.

Shane Gross / Caribbean reef shark (Carcharhinus perezi) and Horse eye jack (Caranx latus) shoal silhouetted underneath catamaran boat, Bahamas.

Gary Bell/ Oceanwide / Bigeye Trevally (Caranx sexfasciatus) school, Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Bigeye Trevally (Caranx sexfasciatus) school under pier, Great Barrier Reef, Australia

Graham Eaton / Shoal of Hardyhead Silverside (Atherinomorus lacunosus) hunted by a shoal of Bluefin Trevally (Caranx melampygus) along a shoreline. Komandoo Island, Maldives, January.

Graham Eaton / Giant trevally (Caranx ignobilis) Komandoo Island, Maldives, January

Graham Eaton / Bluefin Trevally (Caranx melampygus) in deep water, Komandoo Island, Maldives.

Doug Perrine / Dugong or Sea cow (Dugong dugon) feeding on seagrass with commensal juvenile Golden trevally (Gnathanodon speciosus) Calauit Island, off Busuanga, Calamian Islands, Palawan, Philippines.

Franco Banfi / Scuba diver swimming with a big shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Scuba diver on the sandy bottom surrounded by shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Scuba diver on the sandy bottom surrounded by shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Big Gulf grouper (Mycteroperca jordani) in front of a Shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Doug Perrine / Dugong or Sea cow (Dugong dugon) feeding on seagrass with commensal juvenile Golden trevally (Gnathanodon speciosus) Calauit Island, off Busuanga, Calamian Islands, Palawan, Philippines.

Franco Banfi / Scuba diver swim between shoal of Dog snapper, (Lutjanus novemfasciatus) and shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Shoal of Dog snapper, (Lutjanus novemfasciatus) in front of shoal of Big-eye jacks (Caranx sexfasciatus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Alex Mustard / Few fish from a school of Bigeye trevally (+Caranx sexfasciatus) break off to scratch themselves against the flank of a blacktip reef shark (Carcharhinus melanopterus). This is a common and world wide...

Alex Mustard / Long exposure of school of Bigeye trevally (Caranx sexfasciatus) swimming in front of a jetty, close to sunset. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Long exposure portrait of a Tawny nurse shark (Nebris ferrungineus), with Pink whipray (Himantura fai) and Bluefin trevally (Caranx melampygus) at dusk. Vavuu Atoll, Maldives. Indian Ocean

Shane Gross / Southern stingray (Dasyatis americana) feeding in soft sand while a bar jack (Caranx ruber) waits to eat scraps. Eleuthera, Bahamas.

Nick Hawkins / Blue shark (Prionace glauca) with pilot fish (Naucrates ductor) off Halifax, Nova Scotia, Canada. July.

Nick Hawkins / Blue shark (Prionace glauca) with a pair of pilot fish (Naucrates ductor) off Halifax, Nova Scotia, Canada. July.

Ralph Pace / Bigeye Trevally (Caranx sexfasciatus) school, Cabo Pulmo National Park, Baja California, Mexico

Pascal Kobeh / A group of Greater amberjacks (Seriola dumerili) Azores, Atlantic ocean.

Nick Hawkins / Divers observing large school of Bigeye trevally (Caranx sexfasciatus). Near Cocos Island National Park, Costa Rica.

Nick Hawkins / Bigeye trevally (Caranx sexfasciatus), a large shoal. Cocos Island National Park, Costa Rica.

Nick Hawkins / Bluefin trevally (Caranx melampygus), two off Cocos Island National Park, Costa Rica.

Nick Hawkins / Bluefin trevally (Caranx melampygus) swimming amongst other fish. Cocos Island National Park, Costa Rica.

David Fleetham / Bluefin trevally (Caranx melampygus), two above coral reef. Hawaii.

David Fleetham / Bluefin trevally (Caranx melampygus) swimming over coral reef, motion blurred image. Hawaii.

David Fleetham / Tille trevally (Caranx tille), two in inshore reefs. Between Yap and Palau, Micronesia.

David Fleetham / Jack (Caranx sp), shoal of juveniles following Southern stingray (Dasyatis americana), searching for prey. Bahamas.

Alex Mustard / Bigeye trevally (Caranx sexfasciatus) swim in front of volcanic boulders. Darwin Island, Galapagos National Park, Galapagos Islands. East Pacific Ocean.

Alex Mustard / Bigeye trevally (Caranx sexfasciatus) forming a circular shoal in blue water, on the drop off of a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

David Fleetham / Oceanic whitetip shark (Carcharhinus longimanus) with Pilot fish (Naucrates ductor) and Remora (Echeneididae). In open ocean several miles off The Big Island / Hawaii, Hawaii.

Tim Fitzharris / Butterflyfish (Chaetodon sp), Cavalla (Caranx sp), Parrotfish (Scaridae), and Damselfish (Chromis sp) school, Balicasag Island, Philippines

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.

Richard Robinson / Bump-head sunfish (Mola alexandrini) with Pilotfish (Naucrates ductor) offshore, Northern New Zealand.