David Shale / Female Anglerfish fanfin seadevil (Caulophryne jordani) - Deep sea species from Atlantic Ocean, found at 700-3000m.

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...

Alex Mustard / Orange painted frogfish (Antennarius pictus) fishing. Here the frogfish is illuminated by a snooted strobe and the background sand lit with a red LED torch. Bitung, North Sulawesi, Indonesia. Lembeh S...

Tony Wu / View down the throat of a male Zoarchias major eelpout (Zoarchias major) that has opened its mouth during a confrontation with another male. Yamaguchi Prefecture, Japan. Pacific Ocean.

Tony Wu / Two male Zoarchias major eelpouts (Zoarchias major) engaged in a mouth-to-mouth confrontation. Yamaguchi Prefecture, Japan, Pacific Ocean.

Tony Wu / Zoarchias major eelpout (Zoarchias major) with her mouth wide open. Yamaguchi Prefecture, Japan, Pacific Ocean.

David Fleetham / Guineafowl pufferfish (Arothron meleagris) puffed up in defence, Hawaii.

Alex Mustard / Striped mackerel (Rastrelliger kanagurta) shoal swimming with open mouths, filtering for zooplankton. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Alex Mustard / Striped mackerel (Rastrelliger kanagurta) mouth wide open as it swims through the water, filtering zoopankton with its gill rakers. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Ingo Arndt / Sea trout (Salmo trutta trutta) alevin just hatched with full yolk sac, Europe

Alex Mustard / Warty / Clown frogfish (Antennarius maculatus) male portrait, Anilao, Batangas, Luzon, Philippines, March

Alex Hyde / Fishing spider (Trechalea) waiting to catch a Killifish (Cyprinodontiformes) in a rainforest stream at night, Central Caribbean foothills, Costa Rica.

Alex Mustard / Leafy seadragon (Phycodurus eques). Wool Bay Jetty, Edithburgh, Yorke Peninsula, South Australia.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) portrait, captive. Kona, Hawaii. Central Pacific Ocean.

Doug Perrine / Pygmy shark (Euprotomicrus bispinatus) portrait, captive. Kona, Hawaii. Central Pacific Ocean. Digitally manipulated image.

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.

Jordi Chias / Angular roughshark (Oxynotus centrina) a deepsea species living at 80-300m depth, caught by fishermen and released, Costa Brava, Catalunya, Spain, Mediterranean Sea

Claudio Contreras / Mexican blind brotula (Typhliasina pearsei) a blind cave fish, sinkhole near Tulum, Yucatan Peninsula, Mexico, August. Endangered species.

Alex Mustard / Portrait of a Severn's pygmy seahorse (Hippocampus severnsi) at Mioskon Island, Raja Ampat, West Papua, Indonesia. Dampier Strait. Tropical West Pacific Ocean.

Alex Mustard / Tasseled wobbegong shark (Eucrossorhinus dasypogon) yawning. Citrus Ridge, Yanggefo Island, Gam Island, Raja Ampat, West Papua, Indonesia.

Jordi Chias / Atolla jellyfish (Atolla wyvillei) with Gentoo penguin (Pygoscelis papua) in the background near the surface. Antarctic Peninsula. Finalist in the Underwater category of the Wildlife Photographer of t...

Solvin Zankl / Ribbon sawtail fish (Idiacanthus fasciola) from Atlantic Ocean, at a depth of 800-1000m.

Barry Bland / Fried egg jelly fish (Cotylorhiza tuberculata) Mediterranean Sea.

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

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.

Alex Mustard / Male Bullethead parrotfish (Chlorurus sordidus) displaying in late afternoon. Ras Katy, Sinai, Egypt. Gulf of Aqaba, Red Sea.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay South Africa.

Alex Mustard / Peacock flounder (Bothus lunatus) resting on the seabed, East End, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Jeff Rotman / Spotted eagle ray (Aetobatus narinari), underside, Natal Coast, South Africa.

Georgette Douwma / Painted Frogfish (Antennarius pictus), juvenile perched on bottle top. Rinca, Komodo National Park, Indonesia.

Juergen Freund / Schooling Yellowtail fusilier (Caesio cuning) Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Whitemargin stargazer (Uranoscopus sulphureus) half hidden in the sand. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Baby orange Painted frogfish (Antennarius pictus) in a shell on the coral rubble. About 4mm in size. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Sargassum frogfish / anglerfish (Histrio histrio) in its floating Sargassum seaweed home, El Nido, Palawan, Philippines

Alex Mustard / Denise's Pygmy Seahorse (Hippocampus denise) on a coral seafan. Misool, Raja Ampat, West Papua, Indonesia, November.

Alex Mustard / A shoal of Ornate Ghost Pipefish (Solenostomus paradoxus) below a black coral bush (Antipathes sp.). Misool, Raja Ampat, West Papua, Indonesia, November.

Solvin Zankl / Pacific hatchetfish (Argyropelecus affinis) portrait

David Shale / Deep sea fish (Winteria telescopa) with forward pointing tubular eyes.

Alex Mustard / A split level digital composite showing a Basking shark (Ceterhinus maximus) feeding on plankton around St Michael's Mount, Cornwall, UK. June

Alex Mustard / Group of Manta rays (Manta birostris) feeding together on plankton in a shallow lagoon. Hanifaru Lagoon, Baa Atoll, Maldives. Indian Ocean.

Alex Mustard / Large Manta ray (Manta birostris) feeding on plankton in very shallow water, viewed from the surface. Hanifaru Lagoon, Baa Atoll, Maldives. Indian Ocean.

Alex Mustard / A large Great hammerhead shark (Sphyrna mokarran), about 4m in length, cruises overhead. Bahamas, Tropical West Atlantic Ocean.

Doug Perrine / Dolphin fish / Mahi mahi / Dorado (Coryphaena hippurus) large male, off Isla Mujeres, near Cancun, Yucatan Peninsula, Mexico, Caribbean Sea

Jeff Rotman / Mouth of Banded Wobbegong shark (Orectolobus ornatus) Perth, Australia - Indian Ocean.

Jeff Rotman / Nostril and mouth parts of Bamboo shark (Chiloscyllium punctatum) Perth, Australia, Indian Ocean

Jeff Rotman / Close-up of the eye of a Jewel Grouper / Coral hind (Cephalopholis Miniata) Red Sea, Egypt

Wild Wonders of Europe / Lundgren / Black moray (Muraena augusti) with mouth open, Pico and Faial, Azores, Portugal, June 2009 WWE BOOK

Claudio Contreras / Balloon fish (Diodon holocanthus) with defensive spines, Puerto Morelos National Park, Caribbean Sea, Mexico, January

David Shale / Fangtooth (Anoplogaster cornuta) portrait, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Greater silver hatchet fish (Argyropelecus gigas) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Viper fish {Chauliodus sloani}, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Lancetfish {Alepisaurus brevirostris} from Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Head of Lancetfish {Alepisaurus brevirostris} from Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Angler fish Melanocetus murrayi, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Snail fish {Careproctus sp} 0 - 1387m, Mid-Atlantic Ridge, North Atlantic Ocean

Wild Wonders of Europe / Lundgren / European plaice (Pleuronectes platessa) in sand on seabed, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Monkfish / Allmouth (Lophius piscotorius) Lofoten, Norway, November 2008

Wild Wonders of Europe / Lundgren / Monkfish / Allmouth (Lophius piscotorius) close-up of face, Lofoten, Norway, November 2008

Wild Wonders of Europe / Lundgren / Atlantic halibut (Hippoglossus hippoglossus) portrait, Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Anglerfish (Lophius piscatorius) Saltstraumen, Bod, Norway, October 2008

Wild Wonders of Europe / Lundgren / Atlantic halibut (Hippoglossus hippoglossus) portrait, Saltstraumen, Bod, Norway, October 2008

Solvin Zankl / Juvenile Viperfish {Chauliodus sloani}, Atlantic ocean

Solvin Zankl / Deepsea smelt {Bathylagus antarcticus}, found in all the southern oceans as far south as Antarctica, from the surface to depths of 4,000 m, Atlantic ocean

Solvin Zankl / Deep Sea Viperfish {Chauliodus sloani} with chromatophores and bioluminescence, Atlantic ocean

Solvin Zankl / Murrays abyssal anglerfish (Melanocetus murrayi) Atlantic ocean. A deep-sea fish with bioluminescent lure used to attract prey. The bioluminescence is produced by symbiotic bacteria; these bacteria ar...

Solvin Zankl / Scaleless black dragonfish (Melanostomias biseriatus) showing lure, Atlantic ocean

David Shale / Bent nosed rabbitfish {Harriotta raleighana} from the Mid-Atlantic Ridge, 2600m

Juergen Freund / Trunkfish / Longhorn cowfish {Lactoria cornuta}

David Shale / Deepsea fish {Paraliparis sp.) North East, Atlantic Ocean off Cape Verde Islands depth 700-1000m

David Shale / Deepsea fish, Oreo (Neocyttus sp), deep sea Atlantic ocean

Constantinos Petrinos / Giant frogfish {Antennarius commerson} Sulawesi, Indonesia

Solvin Zankl / Giant frogfish {Antennarius commerson} Lembeh, Sulawesi, Indonesia

Solvin Zankl / Striped / hairy frogfish {Antennarius striatus} Lembeh, Sulawesi

Doug Perrine / Ring-eye jawfish male expels larvae after brooding eggs in mouth for a week {Opistognathus sp} Borneo (Non-ex).

Tim MacMillan / John Downer Pr / The Archer fish uses its mouth like a water pistol to shoot down prey from vegetation (Resolution restriction - image digitised from film, 'Weird Nature' tv series). The "pistol" has a range of 1.5m.

Doug Perrine / Smalltooth / Wide sawfish {Pristis pectinata} Everglades NP, Florida, Gulf of Mexico, (Non-ex).

David Shale / Spookfish {Dolichopteryx rostrata} - deepsea species occurring in the twilight zone. Off Cape Verde Iles, Atlantic. (Dolichopteryx rostrata Fukui & Kitigawa, 2006)

Juergen Freund / Wolf eel (Anarhichthys ocellatus) Pacific ocean off Canada

Georgette Douwma / Ornate ghost pipefish in Featherstar. Sulawesi, Indonesia

Juergen Freund / Shoal of Striped catfish, Indo-Pacific

Jeff Rotman / Whale shark (Rhincodon typus) Ningaloo Reef Australia

Jeff Rotman / Wobbegong shark head-on, Australia (Orectolobus maculatus)

Peter Scoones / Leafy seadragon male {Phycodurus eques} Australia

Jeff Rotman / Scalloped hammerhead shark head portrait (Sphyrna lewini) Kanohe Bay, Hawaii.

Jeff Rotman / Humphead wrasse and diver Red Sea. {Cheilinus undulatus}. model released Model released.

John Downer Productions / Peacock flounder attempts to simulate the squares of chessboard (Bothus lunatus) - Resolution restriction due to image digitised from film - 'Weird Nature' BBC tv series.

Juergen Freund / Mouth of Parrotfish, Indian Ocean

Pascal Kobeh / Ocan Pacifique - Nouvelle caldonie - Gros plan de la tte d'un nason licorne (Naso brevirostris) de nuit Pacific Ocean - New Caledonia - A close-up of the head of a spotted or longnose unicornfish (Na...

Alex Mustard / Napoleon wrasse (Cheilinus undulatus) on a coral reef. Ras Mohammed National Park, Sinai, Egypt. Red Sea

Alex Mustard / A portrait of a tiny Unicorn goby (Cerogobius petrophilus). Gubal Island, Egypt. Red Sea.

Alex Mustard / Diver (Jennie Lawson) with a camouflaged Scorpionfish (Scorpaenopsis oxycephala) on a coral reef. Gubal Island, Egypt. Strait Of Gubal, Gulf of Suez, Red Sea.

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 / Portrait of the face of a Hairy frogfish (Antennarius striatus). Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

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

Pascal Kobeh / Stargazer (Uranoscopus sulphureus) half buried in the sand, Sulu sea, Philippines