During the Middle Ages, the output of this industry was sold at the Scania Market, which was controlled by the (*) Hanseatic League.
In Roman times, a byproduct from this industry was made into garum. This is the dominant industry of cities in the U.K. like Peterhead and Grimsby. Conflicts over resources central to this industry escalated in 1972 when a NATO member extended the reach of its Exclusive Economic Zone. It's not salt, but Mark Kurlansky detailed the success of the Basques in one subset of this industry. During the Middle Ages, the output of this industry was sold at the Scania Market, which was controlled by the (*) Hanseatic League. Clashes over this industry led to multiple conflicts between England and Iceland in the mid-20th Century. Major centers of this industry in the US include Dutch Harbor. For 10 points, name this industry, which was at the center of the Cod Wars.
In Roman times, a byproduct from this industry was made into garum.
commercial {fishing} [accept equivalents; prompt on {food}; do not accept “{agriculture}”]