Alex Mustard / Portrait of Male Sockeye salmon (Oncorhynchus nerka) showing teeth. Adams River, British Columbia, Canada, October.

Michel Roggo / Rainbow trout (Salmo gairdneri / Oncorhynchus mykiss) eggs in hatchery, Switzerland, Captive

Laurie Campbell / Male Atlantic salmon {Salmo salar} leaping, migrating upstream to spawn, Perthshire, Scotland, UK, October

Sergey Gorshkov / Salmon (Salmonidae) fry with egg case still attached, Lake Kuril, Kamchatka, Far East Russia, January

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) attempting to catch salmon leaping up rapids, Katmai National Park, Alaska, USA

Linda Pitkin / 2020VISION / Male Atlantic salmon (Salmo salar) after capture and release for an Environment Agency breeding program, showing breeding colours, River Itchen, Hampshire, England, UK, January. Did you know? Salmon n...

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Alex Mustard / An abstract photograph of Sockeye salmon (Oncorhynchus nerka) in their spawning river. Adams River, British Columbia, Canada, October.

Michel Roggo / Dead Sockeye / Red Salmon (Oncorhynchus nerka) after spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Dead Sockeye / Red Salmon (Oncorhynchus nerka) after spawning migration. Adams River, British Columbia, Canada, October.

Lynn M Stone / Man fishing for Coho salmon with Grizzly bears (Ursus arctos horribilis) crossing the stream behind him, Olga Bay, Kodiak Island, Alaska. Non exculsive.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Igor Shpilenok / Red Fox (Vulpes vulpes) with large Pink Salmon (Oncorhynchus gorbuscha). Kronotsky Zapovednik Nature Reserve, Kamchatka Peninsula, Russian Far East, June.

Alex Mustard / Sockeye salmon (Oncorhynchus nerka) migrating upstream in their spawning river. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Alex Mustard / Male Sockeye salmon (Oncorhynchus nerka) on his redd (nest). The female is behind the male, shown here with his characteristic hooked jaw. Adams River, British Columbia, Canada, October.

Bryan and Cherry Alexander / Lines of Stake Nets set out from the beach to catch Atlantic Salmon. St Cyrus Bay, Scotland, 1982.

Alex Mustard / Group of Sockeye salmon (Oncorhynchus nerka) in their spawning river. Adams River, British Columbia, Canada, October.

Charlie Summers / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) catch, Anan Creek, Alaska, July.

Aflo / Salmon (Salmonidae) in freshwater lake, Abashiris, Hokkaido, Japan.

Michael Durham / Coho salmon (Oncorhynchus kisutch) fry portrait, captive.

Michael Durham / Coho salmon (Oncorhynchus kisutch) eggs in a redd / nest, 10 weeks after spawning, Washington, USA, February.

Bryan and Cherry Alexander / Commercial fisherman removing Atlantic salmon (Salmo salar) from stake net. St Cyrus Bay, Scotland, 1982.

Oliver Scholey / Grey wolf (Canis lupus) hunting pacific salmon, Katmai National Park, Alaska, USA, August.

Michel Roggo / Atlantic salmon (Salmo salar) in holding pool on upstream spawning migration, Quebec, Canada, August. Taken for the Freshwater Project.

Michel Roggo / Atlantic salmon (Salmo salar) travelling upstream on spawning migration, Quebec, Canada, August. Taken for the Freshwater Project.

Wild Wonders of Europe / Lundgren / Female Atlantic salmon (Salmo salar) River Orkla, Norway, October 2008

Michel Roggo / Atlantic salmon (Salmo salar) travelling upstream during spawning migration, Quebec, Canada, August. Taken for the Freshwater Project.

Michel Roggo / Sockeye Salmon (Oncorhynchus nerka) travelling upstream on spawning migration, Adams river, British Columbia, Canada, October Taken for the Freshwater Project.

Barry Bland / Rainbow Trout {Salmo gairdneri} Fly Fishing on the Clutha River, Wanaka, New Zealand. Model Released.

Pascal Kobeh / Humpback / Pink salmon (Oncorhynchus gorbuscha) migrating up river to spawn, Alaska, USA.

Jeff Rotman / Family fishing for Sockeye salmon (Oncorhynchus nerka) Graveyard Point, Bristol Bay, Alaska, USA, June. Model released.

Oliver Scholey / Grizzly bear (Ursus arctos horribilis) with Chum salmon (Oncorhynchus keta) Katmai National Park, Alaska, USA, August.

Jeff Rotman / Fisherman untangling Sockeye salmon (Oncorhynchus nerka) from drift gill net. Naknek River, Bristol Bay, Alaska, USA, June 2015. Model released.

Loic Poidevin / Fisherman preparing Salmon (Salmonidae), Finnmark, Norway, June.

Jeff Rotman / Native Alaskan preparing Sockeye salmon (Oncorhynchus nerka) for traditional smoking. Naknek, Bristol Bay, Alaska, USA, June. Model released.

Chris & Monique Fallows / Salmon fishing boat commercially netting Pink salmon (Oncorhynchus gorbuscha) Prince William Sound, Alaska, USA.

Jeff Rotman / Chinook salmon (Oncorhynchus tshawytscha) ready to be cooked. Naknek River, Bristol Bay, Alaska, USA, June.

Jeff Rotman / Fishermen hauling in set gill net to harvest Sockeye salmon (Oncorhynchus nerka) Graveyard Point, Bristol Bay, Alaska, USA. July 2015. Model released.

Jeff Rotman / Leader Creek Fisheries cannery preparing fresh Sockeye salmon (Oncorhynchus nerka) fillets for export worldwide. Naknek, Bristol Bay, Alaska, July 2015.

Ann & Steve Toon / Atlantic salmon (Salmo salar) people measuring smolt collected from smolt trap on Kielder burn, Northumberland, UK, April 2012

Loic Poidevin / Sockeye Salmon (Oncorhynchus nerka) male in river during migration, Katmai, Alaska, USA, August.

Ann & Steve Toon / Atlantic salmon (Salmo salar) smolt for release into the North Tyne, Kielder, Northumberland, UK, April 2012

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) fishing for salmon, Katmai National Park, Alaska, USA, August.

Ann & Steve Toon / Atlantic salmon (Salmo salar) smolts being released into the North Tyne, Kielder, Northumberland, UK, April 2012

Loic Poidevin / Grizzly bear (Ursus arctos horribilis) young with Sockeye salmon, Katmai, Alaska, USA, August.

Wild Wonders of Europe / Lundgren / Atlantic salmon (Salmo salar) being relased by fisherman, Orkla River, Norway, September 2008 (Model released)

Graham Eaton / An Atlantic Salmon (Salmo salar) jumping a waterfall in autumn on the River (Afon) Lledr, Betws-y-Coed, Wales October

Rob Jordan / 2020VISION / Close up of scales of an Atlantic salmon (Salmo salar) caught by Tweed Foundation scientists netting and tagging migratory fish for tracking, on the River Tweed, Berwickshire, Scotland, UK, September

Juergen Freund / Volunteer mixing eggs and sperm of pink salmon. Canada (Oncorhynchus gorbuscha)

Chris Gomersall / 2020VISION / Salmon farm in the Sound of Mull, Inner Hebrides, Scotland, UK, July 2011

Michel Roggo / Atlantic salmon (Salmo salar) in cage of Salmon farm, Norway, Captive

Bryan and Cherry Alexander / Commercial fisherman carrying Atlantic salmon (Salmo salar) along stake net. St Cyrus Bay, Scotland, 1982.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) pair ~spawning on gravel ground, Adams river, British Columbia, Canada, 1990

Rob Jordan / 2020VISION / Fisherman casting for Brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) on the River Tweed, Berwickshire, Scotland, UK, October

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka)~migrating upstream to spawn, Adams river, British Columbia, Canada 2006

Bryan and Cherry Alexander / Man casting long fly line while fishing on the River Tay, Scotland.

Igor Shpilenok / Steller's sea eagle {Haliaeetus pelagicus} about to pick up Sockeye salmon prey in its claws, Kuril Lake, Kamchatka, Far East Russia

David Woodfall / Atlantic salmon (Salmo salar) caught by traditional fisherman at 'putcher station' on Severn estuary. This traditional way of fishing is potentially threatened by the proposed tidal barrage. Glouceste...

Juan Carlos Munoz / Atlantic salmon {Salmo salar} fish farm, fish ready for market, Baltasounds, Unst Island, Shetland Islands, Scotland, UK

David Woodfall / Atlantic salmon (Salmo salar) caught by traditional fisherman at 'putcher station' on Severn estuary. This traditional way of fishing is potentially threatened by the proposed tidal barrage. Glouceste...

Wild Wonders of Europe / Lundgren / Atlantic salmon (Salmo salar) being released by fisherman, Orkla River, Norway, September 2008 (model released)

Staffan Widstrand / Salmon hung up to dry in the tundra winds, Chukotka, Siberia, Russia

Wild Wonders of Europe / Lundgre / Atlantic salmon (Salmo salar) male, River Orkla, Norway, September 2008. WWE OUTDOOR EXHIBITION. WWE BOOK.

Dan Burton / Salmon farm pens out in water, Narvik, Norway, Europe

Eric Baccega / Grizzly bear (Ursus arctos horribilis) catching salmon in Brooks river, Katmai National Park, Alaska, USA, July

Eric Baccega / Grizzly bears catching migrating salmon, Brooks river, Katmai Alaska {Ursus arctos horribilis}

Bryan and Cherry Alexander / Nivkhi fisherman retrieving Chum salmon (Oncorhynchus keta) from net at sunset. Niva Bay, Sakhalin Island, Russian Far East, 2006.

Denis-Huot,Denis-Huot / Grizzly bears (Ursus arctos horribilis) looking for salmon, Brooks river, Katmai national park, Alaska, North America,

Bryan and Cherry Alexander / Nivkhi woman hanging fillets of Salmon (Oncorhynchus) to dry at Niva Bay. Sakhalin Island, Russian Far East, 2006.

Bryan and Cherry Alexander / Commercial fisherman removing Atlantic salmon (Salmo salar) from stake net. St Cyrus Bay, Scotland, 1982.

Andy Rouse / Grizzly Bear (Ursus arctos horribilis) thrashing a large caught salmon. Katmai, Alaska, USA, August.

Floris van Breugel / Kokanee Salmon (Oncorhynchus nerka) on Autumn migration up Taylor Creek from Lake Tahoe, California, USA.

Alex Mustard / A split level photo of male Sockeye salmon (Oncorhynchus nerka) in Adams River, British Columbia, Canada, October.

Sergey Gorshkov / Salmon (Salmonidae) migrating to spawn in Lake Kuril, Kamchatka, Far East Russia, August

Sergey Gorshkov / Sockeye salmon (Oncorhynchus nerka) spawning, Lake Kuril, Kamchatka, Far East Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) catching salmon in river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) fishing for migrating salmon, Lake Kuril, Kamchatka, Far east Russia, August 2005

Chris & Monique Fallows / Bald Eagle juvenile (Haliaeetus leucocephalus) feeding on pink salmon, Fidalgo inlet, Alaska, USA.

Andy Rouse / Grizzly Bear (Ursus arctos horribilis) with a large salmon in its mouth. Katmai, Alaska, USA, August.

Alex Mustard / Sockeye salmon (Oncorhynchus nerka) in their spawning river. Adams River, British Columbia, Canada, October.

Matthew Maran / Black Bear (Ursus americanus) with a Chinook Salmon (Oncorhynchus tshawytscha) in its mouth. Ucluth Inlet, Barkley Sound, Vancouver Island, Canada, September.

Ann & Steve Toon / Stripping eggs from Atlantic salmon (Salmo salar) selected for broodstock at hatchery, Kielder Salmon Centre, Kielder, Northumberland, UK, November 2011

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Ann & Steve Toon / Atlantic salmon (Salmo salar) tray of alevin, Kielder Salmon Hatchery, Northumberland UK, March 2012

Linda Pitkin / 2020VISION / Female Atlantic salmon (Salmo salar) migrating up river to spawn, River Caldew, Cumbria, England, UK, November 2011. Did you know? Atlantic salmon can grow to 1.5 meters in length.

Todd Mintz / Sockeye salmon (Oncorhynchus nerka) split level view of annual spawning run, Adams River, British Columbia, Canada, October

Linda Pitkin / 2020VISION / Fisheries assistant Stephanie Kershaw and volunteer John Dumont at the Eden Rivers Trust electrofishing for juvenile Atlantic salmon (Salmo salar) and Brown trout (Salmo trutta) as part of a capture a...

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Michel Roggo / Sockeye / Red Salmon (Oncorhynchus nerka) on spawning migration. Adams River, British Columbia, Canada, October.

Ross Hoddinott / 2020VISION / School child releases salmon fry in the River Haddeo, with Westcountry Rivers Trust (WRT) warden. Bury, Exmoor National Park, Somerset, UK. May 2012. Editorial use only

Alex Mustard / A split level photo of group of Sockeye salmon (Oncorhynchus nerka) fighting their way upstream as they migrate back to the river of their birth to spawn, trees showing autumnal colours. Adams River,...

Alex Mustard,Alex Mustard / A female (in front) and male Sockeye salmon (Oncorhynchus nerka) over eggs in their spawning river. Adams River, British Columbia, Canada, October.

Will Watson / Atlantic salmon (Salmo salar) leaping a weir, Shrewsbury, River Severn, Shropshire, England, UK. November.

Ann & Steve Toon / Atlantic salmon (Salmo salar) leaping on upstream migration, River Tyne, Hexham, Northumberland, UK, November