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Averages and dispersion

Salmon runs in hot water?

Climate change and the modification of rivers by humans are putting the epic mass migrations of salmon and trout at risk and their numbers in the wild are dwindling. Reproductive biologist Miriam Fenkes describes the challenges faced by salmonids on their journey

Salmon jumping up a waterfall

Adult salmon and trout (collectively ‘salmonids’) are famous for their reproductive migrations — the salmon runs. They often swim thousands of miles to reproduce in their original spawning grounds. This is a vitally important journey — not only for the fish. Migrating salmonids are a predictable food source and bring nutrients to rivers and lakes. Predators such as bears anticipate the arrival of this bounty and time their own lives around it. Salmonids are also an important economic resource for humans.

Salmonids

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Strychnine

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Averages and dispersion

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