Three researchers from the NOAA Alaska Fisheries Science Center completed a trawl survey of the Northern Bering Sea in 2017 and found a dramatic increase in pollock. 

The “thermal curtain” is another expression for “cold pool” that acts as a barrier to keep some species—pollock and Pacific cod, for example — from migrating across the eastern Bering Sea shelf and northward toward the Bering Strait. For the first time in 37 years of surveying the Bering Sea, we could not find the cold water barrier.