Igor Shpilenok / Pink salmon {Oncorhynchus gorbuscha} Tyatinka River, Kurilsky Zapovednik Russia.

Nick Hawkins / Pink salmon (Oncorhynchus gorbuscha) migrating up a river in the Great Bear Rainforest near Bella Bella, British Columbia, Canada. September

Nick Hawkins / Pink salmon (Oncorhynchus gorbuscha) migrating up a river in the Great Bear Rainforest near Bella Bella, British Columbia, Canada. September

Nick Hawkins / Pink salmon (Oncorhynchus gorbuscha) migrating up a river in the Great Bear Rainforest near Bella Bella, British Columbia, Canada. September

Charlie Summers / Pink / Humpback Salmon (Oncorhynchus gorbuscha) male, dying with parts of flesh rotting, trying to make it upstream to its spawning grounds, Ketchikan Creek in the middle of Ketchikan, Alaska.

Michael Quinton / Pink Salmon (Oncorhynchus gorbuscha) trio spawning, Prince William Sound, Alaska

SCOTLAND: The Big Picture / Atlantic salmon (Salmo salar) eggs after collecting from an adult female fish, Sandbank hatchery, Glenlivet, Moray, Scotland, UK, November.

SCOTLAND: The Big Picture / Atlantic salmon (Salmo salar) eggs after collecting from an adult female fish, Sandbank hatchery, Glenlivet, Moray, Scotland, UK, November.

SCOTLAND: The Big Picture / Atlantic salmon (Salmo salar) eggs after collecting from an adult female fish, Sandbank hatchery, Glenlivet, Moray, Scotland, UK, November.

Charlie Summers / Humpback salmon (Oncorhynchus gorbuscha) male that has contracted the onset of gray mold / grey mould, making its way upstream in Walker Cove Creek, Misty Fjord National Monument, Alaska, USA, August...

Mark Carwardine / Orca (Orcinus orca), transient, spyhopping and carrying Pink Salmon (Oncorhynchus gorbuscha) prey, southeast Alaska

Matthias Breiter / Black Bear (Ursus americanus) with Pink Salmon (Oncorhynchus gorbuscha) prey, Anan Creek, Tongass National Forest, Alaska