The Gulf of Alaska federal Pacific cod fishery for 2020 will not open due to low stocks. Ocean warming, not overfishing, is being blamed. That is the latest on Pacific cod, but a0nother type, black cod, also known as sablefish, is in the midst of its own challenge. Young black cod are so plentiful they are getting accidentally caught by big Bering Sea trawlers, and that’s causing problems for the smaller boats that target sablefish.