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.