October 25, 2019 — Biologists were shocked in 2017 when they found that the numbers of Pacific cod had risen exponentially in the northern Bering Sea off the coast of Alaska. Now, researchers at NOAA’s Alaska Fisheries Science Center have used genetic testing to prove that those fish, enabled by warming waters and a lack of sea ice, have moved north from the southeastern Bering Sea.
Surveys as recent as the 1970’s revealed “trace amounts” of cod in the northern Bering Sea, according to a brief released by NOAA. Major Alaska cod fisheries in the past decades have operated in the southeastern Bering Sea, the Aleutian Islands, and the Gulf of Alaska, which meant management biologists conducted only sporadic bottom trawl surveys in the north.