What’s driving changes in cod spawning grounds: climate or fishing?

Northeast Arctic Cod perform seasonal migrations from their feeding grounds to their spawning grounds. Recent evidence suggests that the distribution of cod between spawning grounds is changing. Two hypotheses have been proposed to explain why fish spawning grounds are changing: climate and fishing pressure. In order to determine which of these hypotheses may be the driving force in changing Northeast Arctic Cod populations, a team of scientist from Europe investigated fishery data from 2008-2016. Their results suggests that climate is driving changes in the distribution of Northeast Arctic cod spawning grounds.

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Homeward Bound: Salmon Straying in the Pacific Northwest

For salmon to complete their life cycle, juveniles must migrate out to the ocean and return as adults to spawn in the river where they were born. Adult salmon find their way back to their natal river after years at sea through a process called “homing”, a phenomenon that scientists still don’t fully understand. Some salmon never make it home at all, which can have lasting effects on populations. Read on to learn more!

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