Nuno Sa / Great Blue Shark (Prionace glauca), dorsal view against dark water. Over 20 million Blue Sharks are fished annually, as bycatch and due to the high value of their fins. Azores, North Atlantic, Septemb...

Doug Perrine / Green turtle {Chelonia mydas} caught in 'ghost' fishing net, Cayman Islands, Caribbean

Michael W. Richards / Greater black backed gulls feeding on bycatch {Larus marinus} Norway, Europe

Jeff Rotman / Diver examining hooked Swordfish {Xiphias gladius} caught on longline fishing hook, underneath boat, Cocos Island, Costa Rica, Pacific Ocean, WHS

Shane Gross / Green sea turtle (Chelonia mydas), drowned, hooked and tangled in fishing line as bycatch. Bahamas.

Richard Herrmann / California Sea Lion (Zalophus californianus) group killed as bycatch in gillnet, Coronado Islands, Baja California, Mexico

Richard Herrmann / California Sea Lion (Zalophus californianus) group killed as bycatch in gillnet, Coronado Islands, Baja California, Mexico

SCOTLAND: The Big Picture / Fisherman holding two Catsharks as bycatch from a lobster pot, Lamlash Bay, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

Jordi Chias / Pelagic stingray (Pteroplatytrygon violacea) trapped in an abandoned longline, example of bycatch, Barcelona coast, Spain, Mediterranean sea

Jeff Rotman / Bycatch of Yellowtail flounders (Limanda ferruginea) and Atlantic cod (Gadus morhua) on the deck of fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, March 2009.

Jeff Rotman / Bycatch of Yellowtail flounders (Limanda ferruginea) and Atlantic cod (Gadus morhua) on the deck of fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, March 2009.

Jeff Rotman / Bycatch of Yellowtail flounders (Limanda Ferruginea) and Little skate (Leucoraja erinacea) on deck of fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, March 2009.

Jeff Rotman / Bycatch of Yellowtail flounders (Limanda ferruginea) on deck of fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, March 2009.

Jeff Rotman / Fishermen removing assorted bycatch from deck of fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, December 2011. Model released.

Jeff Rotman / Bycatch including Little skates (Leucoraja erinacea) discarded from fishing dragger. Stellwagen Banks, New England, United States, North Atlantic Ocean, December 2011.

Jeff Rotman / Bycatch of Little skates (Leucoraja erinacea) and Yellowtail flounder (Limanda ferrunginea) being returned to ocean from trawler. Stellwagen Banks, New England, United States, North Atlantic Ocean

Jeff Rotman / Haul of shrimp and bycatch, including many juvenile fish, on semi-industrial Shrimp dragger. Maputo, Mozambique.

Jeff Rotman / Shrimp and bycatch on deck of trawler, Costa Rica, Pacific Ocean.

Jeff Rotman / Herring Gull (Larus argentatus) feed on fishing trawler bycatch. Stellwagen Banks, New England, United States, North Atlantic Ocean

Jeff Rotman / Fisherman shoveling bycatch of Little Skate (Leucoraja erinacea), American lobster (Homarus americanus) and Yellowtail Flounder (Limanda ferruginea) overboard. Stellwagen Banks, New England, United St...

Jeff Rotman / Bycatch of American lobster (Homarus americanus), Brown Crab (Cancer pagurus), Little Skate (Leucoraja erinacea), Yellowtail Flounder (Limanda ferruginea) and Northern Sea Star (Asterias rubens) on de...

Jeff Rotman / Bycatch of Yellowtail Flounder (Limanda ferruginea) on deck of fishing trawler. Stellwagen Banks, New England, United States, North Atlantic Ocean Model released.

Jeff Rotman / Fisherman shoveling bycatch of American lobster (Homarus americanus), Atlantic Cod (Gadus morhua) and Little Skate (Leucoraja erinacea) overboard. Stellwagen Banks, New England, United States, North A...

Cheryl-Samantha Owen / Fishing for West coast rock lobster (Jasus lalandii) aboard the James Archer (Oceana Fisheries). Fisherman inspects bycatch - a small crab, in Saldanha Bay and St. Helena Bay, Western Cape, South Afri...

Gerrit Vyn / Laughing gulls (Leucophaeus atricilla) reap rewards of Louisiana shrimp trawler dumping bycatch overboard, Cocodrie, Louisiana, USA

Michael Pitts / Dead Green Turtle (Chelonia mydas) entangled in rope floating at the sea surface. Near Karan Island, Arabian Gulf.

Pete Oxford / Great Hammerhead (Sphyrna mokarran) bycatch Mahaual Town, Yucatan Peninsula, Mexico, October.

Pete Oxford / Fisherman removing Great Hammerhead (Sphyrna mokarran) bycatch from his nets. Mahaual Town, Yucatan Peninsula, Mexico.

Juergen Freund / Assorted fish and a crustacean brought up by a trawler. Most are 'trash fish', small in size, with low consumer preference and little or no commercial value. They are sometimes retained for use as ani...

David Tipling / Gulls, mostly Slaty-backed Gulls {Larus schisisogus} feeding on dead starfish dumped on quay from fishing trawlers, Hokkaido, Japan, February 2008.

Jeff Rotman / Fishermen pulling up a net full of shrimp and bycatch onboard semi-industrial shrimp dragger. Maputo, Mozambique, November 2008

Jeff Rotman / Fishermen pulling up a net full of shrimp and bycatch onboard semi-industrial shrimp dragger. Maputo, Mozambique, November 2008

Jeff Rotman / Shrimp and bycatch of juvenile fish and jellyfish from semi-industrial shrimp dragger, Maputo, Mozambique.

Jeff Rotman / Fisherman sorting Shrimp and bycatch on shrimp dragger, Maputo, Mozambique, November 2008

Fred Bavendam / Grey Reef Shark (Carcharhinus amblyrhynchos) dead after becoming entangled in fishing net, Thailand

Doug Perrine / Crew of longline fishing boat pulls in a Great blue shark (Prionace glauca) taken as bycatch while fishing for Porbeagle shark; they are not allowed to keep the low-value blue shark and will throw it...

Juergen Freund / Fishing catch of sharks at market, Spain

Pete Oxford / Tiger shark carcass on beach (Galeocerdo cuvieri) caught on long line, Zanzibar, Tanzania

Doug Perrine / Dead Sandbar shark hanging under fishing boat {Carcharhinus plumbeus} killed by longline fishing, Philippines

Norbert Wu / Shrimp trawl catch, shrimp trawling results in tremendous bycatch and waste, up to 12 times bycatch for one pound of shrimp, Gulf of Mexico, Texas

Norbert Wu / Shrimper culling his catch, up to 12 times bycatch for one pound of shrimp, populations and habitat threatened by too many trawlers, Texas, USA, Gulf of Mexico

Norbert Wu / Shrimper culling his catch, up to 12 times bycatch for one pound of shrimp, populations and habitat threatened by too many trawlers, Texas, USA, Gulf of Mexico

Jeff Rotman / Diver releases hooked Manta Ray {Manta birostris} caught on longline fishing hook, Cocos Island, Costa Rica, Pacific Ocean, WHS Model released.

Jeff Rotman / Diver inspecting Black Marlin {Makaira indica} caught on longline fishing hook, Cocos Island, Costa Rica, Pacific Ocean, WHS Model released.

Jeff Rotman / Hawksbill turtle hooked on long line {Eretmochelys imbricata} Cocos Island, Costa Rica, Pacific Ocean

Ralph Pace / Smooth Hammerhead Shark (Sphyrna zygaena) juvenile caught as bycatch, Sea of Cortez, Mexico

Ralph Pace / Smooth Hammerhead Shark (Sphyrna zygaena) juvenile caught as bycatch, Sea of Cortez, Mexico

Pete Oxford / Bottlenose Dolphin (Tursiops truncatus) head carried by man, a victim of bycatch, small fishing village of Lavanono on the southern coast of Madagascar

Flip Nicklin / Biologist documenting dolphin bycatch, Sri Lanka

Sirachai Arunrugstichai / Starry puffer (Arothron stellatus) is seen floating at the surface after being discarded as bycatch from a commercial purse seiner, Andaman Sea, Thailand, Krabi Province, Thailand, December 2015.

Sirachai Arunrugstichai / Bottlenose wedgefish (Rhynchobatus australiae) juvenile that was caught as bycatch in gill nets, handled while being held in captive pond, Chonburi Province, Thailand, March

Juergen Freund / Sea floor littered with discarded bycatch from commercial fishing vessels, taken with fisheye lens. Indonesia. 2018.

Juergen Freund / Sea floor littered with discarded bycatch from commercial fishing vessels. Indonesia. 2018.

Sirachai Arunrugstichai / Diversity of marine life caught as bycatch from shrimp trawler in the Andaman Sea, Phuket fish landing site, Phuket Province, Thailand, December 2012.

Philippe Clement / Shrimpers sorting catch from shrimp drag net / dragnet on the beach caught along the North Sea coast at dusk, Belgium. June

Philippe Clement / Shrimper sorting catch from shrimp drag net on the beach caught along the North Sea coast, Belgium. June

Philippe Clement / Shrimper's catch from shrimp drag net on the beach showing shrimps, crabs and fish like sole, lesser weever, mackerel caught along the North Sea coast, Belgium. June