W K FLETCHER / SCIENCE PHOTO LIBRARY W K FLETCHER / SCIENCE PHOTO LIBRARY
Sockeye salmon. Male sockeye salmon (Oncorhynchus nerka) during spawning. These fish are born in rivers in Canada and Alaska, USA. They spend the first few years of their lives living there, before moving into the Pacific Ocean, where they stay for around three years. They then begin a migration back to the river in which they were born, which may cover thousands of kilometres. They locate their river using their excellent sense of smell. The males develop a red coloration and powerful jaws with which to fight each other during spawning. These efforts leave most males dead after spawning. Photographed in Takla Lake, British Columbia, Canada.
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