Sergio Hanquet / Wide-eyed flounder (Bothus podas) portrait showing eyes above head, Tenerife, Canary Islands.

Shane Gross / Larval flounder (possibly Laeops Kitahara) in the open ocean at night off Anilao, Philippines.

Solvin Zankl / Flatfish (Bothidae sp) larva, Atlantic Ocean off Cape Verde. Captive.

Sue Daly / Close up of the face of a Brill (Scophthalmus rhombus), swims out of frame, Sark, British Channel Islands, UK, August.

Sue Daly / Brill (Scophthalmus rhombus) camouflaged on the seabed, Sark, British Channel Islands, UK, August.

Sue Daly / Close up of a Plaice (Pleuronectes platessa), swims away, Sark, British Channel Islands, UK, June.

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 / Lemon sole (Microstomus kitt) portrait. Gardur, south west Iceland. North Atlantic Ocean

Flip Nicklin / Flatfish (Pleuronectiformes) camouflaged on ocean floor, California

Magnus Lundgren / Wild Wonders of China / Peacock flounder (Bothus mancus), Green Island, Taiwan.

Magnus Lundgren / Wild Wonders of China / The peacock flounder (Bothus mancus), Green Island, Taiwan.

Magnus Lundgren / Wild Wonders of China / Peacock flounder (Bothus mancus), Green Island, Taiwan.

Shane Gross / Winter Flounder (Pseudopleuronectes americanus) amongst Algae in seagrass bed. Newfoundland, Canada. May.

Alex Mustard / Topknot (Zeugopterus punctatus) rests on the seabed, covered in tiny copepod parasites. Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic

Alex Mustard / Portrait of Topknot (Zeugopterus punctatus). Swanage, Dorset, England, United Kingdom. English Channel. North East Atlantic

Aflo / False colour x-ray of Marbled sole ( Pseudopleuronectes yokohamae ) fish skeleton.

Shane Gross / Peacock flounder (Bothus lunatus) settling at night. The Bahamas.

Alex Mustard / Courtship between a pair of Eyed flounder (Bothus ocellatus). West Bay, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Georgette Douwma / Cockatoo flounder (Samaris cristatus). Lembeh Strait, North Sulawesi, Indonesia.

Magnus Lundgren / Unknown flounder species (6 cm long), possibly juvenile Kithara's flounder (Laeops kitaharae) Balayan Bay from Anilao, Batangas, Philippines.

Chris Shields / Illustration of Plaice / Flatfish (Pleuronectes platessa)

Chris Shields / Illustration of Dab (Limanda limanda)

Magnus Lundgren / Many-spotted lefteye flounder (Arnoglossus polyspilus) larval juvenile, transparent and pelagic, Balayan Bay, off Anilao, Batangas, Philippines, Pacific Ocean. Magnus

Magnus Lundgren / Unknown flounder species (6 cm long), possibly juvenile Kithara's flounder ( Laeops kitaharae) Balayan Bay from Anilao, Batangas, Philippines. Magnus

Philippe Clement / Common dab fishes (Limanda limanda) on ice on display in fish shop / fish market

Pascal Kobeh / Peacock flounder (Bothus mancus) lying on the sandy seabed, Revillagigedo islands, Mexico. Pacific Ocean.

Magnus Lundgren / Larval three-spot flounder, or many-eyed flounder (Grammatobothus polyophthalmus) Balayan Bay, Luzon Island, Philippines Magnus

Magnus Lundgren / Juvenile lefteye flounder (Bothidae sp.) photographed at night, Balayan Bay, Luzon, Philippines. Magnus

Philippe Clement / European plaice (Pleuronectes platessa) fishes on ice on display in fish shop / fish market

Fred Olivier / Pacific dover sole (Microstomus pacificus) moving on sand, Marovo Lagoon, Solomon Islands.

Nick Hawkins / A winter flounder (Pseudopleuronectes americanus) camouflaged against the seabed off Nova Scotia, Canada. July.

Nick Hawkins / A winter flounder (Pseudopleuronectes americanus) camoflages against the seafloor off Nova Scotia, Canada. July.

Pascal Kobeh / Close-up of Peacock flounder (Bothus mancus), Sulu sea, Philippines

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on the sandy bottom, Canary Islands

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on the sandy bottom, Canary Islands

Shane Gross / Larval flounder (possibly Laeops Kitahara) in the open ocean at night off Anilao, Philippines.

Pascal Kobeh / Wide-eyed flounder (Bothus podas) on a sandy bottom, Azores, Atlantic ocean.

Georgette Douwma / Leopard flounder fish (Bothus pantherinus) camouflaged on sand. North Sulawesi, Indonesia.

Tony Wu / Hairy frogfish (Antennarius striatus) examining flatfish as a potential meal. Lembeh Strait, Celebes Sea, North Sulawesi, Indonesia.

Linda Pitkin / Peacock flounder (Bothus lunatus), camouflaged on sandy sea bed Bonaire, Leeward Antilles, Caribbean.

Doug Perrine / Planktonic larval left-eyed flounder or flatfish, possibly Engyprosopon xenandrus. Photographed at night in surface waters of deep ocean off Kailua Kona, Hawaii, Central Pacific Ocean.

Doug Perrine / Left-eyed flounder (Engyprosopon xenandrus) larva, photographed at night in surface waters of deep ocean off Kailua Kona, Hawaii, USA.

Ashley Cooper / Man with a Pacific halibut (Hippoglossus stenolepis) caught during sport fishing, Seward, Alaska, USA, September 2004.

Jean E. Roche / Juvenile Sole (Solea vulgaris) fish fry, caught for scientific research by Tour du Valat. La Gacholle, Camargue, France.

Sue Daly / Flounder (Platichthys flesus), Trondheimsfjord, Norway, July.

Sue Daly / Flounder (Platichthys flesus), Trondheimsfjord, Norway, July.

Sue Daly / Norwegian topknot (Phrynorhombus norvegicus), Trondheimsfjord, Norway, July.

Sue Daly / European plaice (Pleuronectes platessa) close up, Jersey, British Channel Islands, June.