In this Oct. 29, 2015, file photo, a cod to be auctioned sits on ice at the Portland Fish Exchange, in Portland, Maine. Russia, along with Iceland and Norway, remains a major producer of the white fish, which it harvests from the Barents Sea and other frigid oceans. The U.S. is clamping down on trade with Russia, and is targeting seafood in particular. (AP Photo/Robert F. Bukaty, File)