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

Michel Roggo / Chum / Dog Salmon (Oncorhynchus keta) in resting pool on migration upstream to spawn, Weaver Creek, British Columbia, Canada, 1989

Mark Carwardine / Firing chum slick into the water as bait for Great white shark cage-diving, Guadalupe Island, Mexico (North Pacific)

Charlie Summers / Black bear (Ursus americanus) with Dog salmon (Oncorhynchus keta) catch. Note the teeth the male Dog / Chum Salmon grows during the spawning season. Alaska, USA, July

Mike Read / Wandering albatross (Diomedia exulans), Cape pigeon (Daption capense) and Northern giant petrel (Macronectes halli) on sea feeding on chum, Kaikoura, New Zealand

Mike Read / Wandering albatross (Diomedia exulans), Cape pigeon (Daption capense) and Northern giant petrel (Macronectes halli) on sea feeding on chum, Kaikoura, New Zealand

Doug Perrine / Courtship of Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, female in center, males on left and right, Sheep Bay, Prince William Sound, Alaska, USA, July

Doug Perrine / Male Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Doug Perrine / Courtship of Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, female in center, males on left and right, Sheep Bay, Prince William Sound, Alaska, USA, July

Doug Perrine / Female Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, body decomposing in preparation for death after spawning, Bear Trap, Port Gravina, Prince William Sound, Alaska, U...

Doug Perrine / Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Doug Perrine / Female or immature male Chum / Dog / Silverbrite / Keta salmon (Oncorhynchus keta) in spawning stream, Bear Trap, Port Gravina, Prince William Sound, Alaska, USA, July

Bryan and Cherry Alexander / Train near Salekhard commemorating the victims of Stalin's railway from Chum - Labatnyangi - Salekhard - Igarka (501 km). Yamal, NW Siberia, Russia, February 2007.

Matthias Breiter / Bald Eagle (Haliaeetus leucocephalus) with Chum Salmon (Oncorhynchus keta) along Chilkat River, Haines, Alaska

Doc White / Chum salmon (Oncorhynchus keta) swimming upstream to spawn. Alaska, USA

Bryan and Cherry Alexander / Khanty and Forest Nenet Reindeer / Caribou herders constructing their 'Chum' (tent). Khanty Mansiysk, Western Siberia, Russia, 2000.

LYNN M. STONE / Male Grizzly Bear (Ursus arctos horribilis) splashing towards shore with a Chum Salmon caught in McNeil River, Alaska, USA, July

LYNN M. STONE / Grizzly Bear (Ursus arctos horribilis) splashing towards shore with a Chum Salmon caught in McNeil River, Alaska, USA, July (Note orange salmon eggs on bear, on its right eye, and dripping into water)

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs and alevins, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs, native to the Pacific Ocean

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) eggs, native to the Pacific Ocean

George McCarthy / Grizzly Bear {Ursus arctos horribilis} with caught Chum Salmon, Alaska, USA

George McCarthy / Grizzly Bear (Ursus arctos horribilis) with Chum Salmon (Oncorhynchus keta) Alaska, USA

LYNN M. STONE / Grizzly bear with freshly caught Chum salmon (Ursus arctos horribilis) McNeil river, Alaska, USA

Hiroya Minakuchi / Chum Salmon (Oncorhynchus keta) male in breeding coloration, southeast Alaska

Nature Production / Close up of Fish scale of Chum / Dog Salmon {Oncorhynchus keta} Japan

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska

LYNN M. STONE / Grizzly bear {Ursus arctos horribilis} fishes for salmon McNeil River Game Sanct Alaska