Shifting pollock spawning complicates fisheries management in Gulf of Alaska

Pollock are transferred from a fishing boat into a processing plant in Dutch Harbor, in the Aleutian Islands, in January 2019.

But the timing of pollock spawning is becoming more unreliable, as human-caused climate change warms the ocean. That means the scientific surveys that are used for fisheries management could become unreliable too. To understand the mismatch, Rogers and her collaborators worked backwards using surveys of larval pollock.

But Rogers says spawning time isn’t the only thing fisheries surveys need to pay attention to — warming oceans may be changing fish in all kinds of ways.in the Bering Sea, for instance, showed that as sea ice melts, populations of pollack are moving further north, out of the typical survey areas.

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