Franco Banfi / Loggerhead turtle (Caretta caretta) accompanied by pilotfish (Naucrates ductor) swimming near the surface. Vulnerable. Santa Maria Island, Azores, Portugal, Atlantic Ocean

Shane Gross / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) shoal swimming over Turtlegrass (Halophila stipulacea) seagrass bed. Marsa Alam, Egypt.

Brandon Cole / Oceanic whitetip shark (Carcharhinus longimanus) and Pilotfish (Naucrates ductor) swimming under a stormy surface. Egypt, Red Sea.

Brandon Cole / Steel pompano (Trachinotus stilbe) fish swimming under stormy seas at Roca Redonda offshore Baja, Mexico, Pacific Ocean.

Franco Banfi / Blue shark (Prionace glauca) and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Franco Banfi / Blue shark (Prionace glauca) with fishing hook caught in mouth and Pilot fish (Naucrates ductor), Pico Island, Azores, Portugal, Atlantic Ocean

Alex Mustard / Dugong (Dugong dugon) male, swims over seagrass meadow (Halophila stipulacea) accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

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...

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

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

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

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

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...

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

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

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,...

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 / 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.

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.

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.

Alex Mustard / RF - Male Dugong (Dugong dugon) swimming beneath the surface with a young Golden trevally (Gnathanodon speciosus) alongside, Marsa Alam, Egypt, Red Sea. (This image may be licensed either as rights ma...

Sirachai Arunrugstichai / Large school of Bigeye trevally (Caranx sexfasciatus) congregating over an underwater pinnacle, Adang-Rawi Archipelago, Satun, Andaman Sea, Thailand.

Sirachai Arunrugstichai / Bigeye trevally (Caranx sexfasciatus) swimming inside an artisanal fish trap, Adang-Rawi Archipelago, Andaman Sea, Satun, Thailand.

Sirachai Arunrugstichai / Bigeye trevally (Caranx sexfasciatus) and Giant trevally (Caranx ignobilis) swimming inside an artisanal fish trap of the indigenous Urak Lawoi tribe, Adang-Rawi Archipelago, Andaman Sea, Satun, Thail...

Sirachai Arunrugstichai / Whale shark (Rhincodon typus), an endangered species, feeding on zooplankton in nutrient-rich murky water, being followed by a school of Cobia (Rachycentron canadum), Adang-Rawi Archipelago, Satun, An...

Sirachai Arunrugstichai / Large school of Bigeye trevally (Caranx sexfasciatus) swimming midwater, Adang-Rawi Archipelago, Andaman Sea, Satun, Thailand.

Sirachai Arunrugstichai / Large school of Bigeye trevally (Caranx sexfasciatus) swimming midwater, Adang-Rawi Archipelago, Andaman Sea, Satun, Thailand.

Sirachai Arunrugstichai / Large school of Herring scad (Alepes vari) congregating near the tip of an underwater pinnacle, feeding on food in the current, Richelieu Rock, Mu Koh Surin National Park, Andaman Sea, Phang-nga, Thai...

Sirachai Arunrugstichai / Large school of Herring scad (Alepes vari) congregating near the tip of an underwater pinnacle, feeding on food in the current, Richelieu Rock, Mu Koh Surin National Park, Andaman Sea, Phang-nga, Thai...

Sirachai Arunrugstichai / Large school of Herring scad (Alepes vari) congregating near the tip of an underwater pinnacle, feeding on food in the current, Richelieu Rock, Mu Koh Surin National Park, Andaman Sea, Phang-nga, Thai...

Sirachai Arunrugstichai / School of bigeye trevally (Caranx sexfasciatus) swimming in midwater, congregating at Richelieu Rock, a pinnacle that is regarded as one of the top dive sites in the Andaman Sea, Mu Koh Surin National...

Claudio Contreras / King mackerel (Scomberomorus cavalla) and Bluestripe jack (Caranx crysos) caught by local fishermen. Salado Barra, Honduras. Caribbean Sea.

Claudio Contreras / Bluestripe jack (Caranx crysos) caught by local fishermen. Salado Barra, Honduras. Caribbean sea.

Doug Perrine / Hunting coalition of Blue goatfish / Yellowsaddle goatfish (Parupeneus cyclostomus), Bluefin trevally (Caranx melampygus) and Whitemouth moray eel (Gymnothorax meleagris) on a reef, Makako Bay, Kona,...

Doug Perrine / Humpback whale (Megaptera novaeangliae) female and calf being escorted by male, with Mackerel scad (Decapterus macarellus) swimming around them, Kohala, Hawaii, Pacific Ocean.

Doug Perrine / Oceanic whitetip shark (Carcharhinus longimanus) accompanied by Pilot fish (Naucrates ductor), and small Remora (Remora sp.) fish, Big Island, Hawaii, Pacific Ocean.