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Nearly 30,000 Chinook salmon were wasted as bycatch in the Canadian trawl fishery, which was targeting hake and walleye pollock, a new report from Canadian fisheries officials found.

Katherine Maslenikov carefully plucked a young walleye pollock specimen from a glass jar full of ethyl alcohol.

At the same time, they are documenting the disappearance of the “cold pool” — a region of the northern Bering Sea that for thousands of years has served as a barrier that protects cold-water species, such as Arctic cod and snow crab, from subarctic species, such as walleye pollock and Pacific cod.

Consider the plight of the walleye pollock — also known as Alaska pollock — one of the region’s most important fisheries.

While adult walleye pollock are averse to super cold water, juveniles are known to gravitate to the interior of the cold pool.