Massive reduction in red tape for a lot of exports. In particular, some fresh food products had become almost impossible to export because of extra inspections and bureaucratic delays meaning they would not be fresh on arrival. Those exports can get back to normal.
Ironically some fresh fish, in particular shellfish, fall into this category. So far from selling out the fishing industry some sectors of it will get a huge boost. In return the EU will carry on as they are for another 12 years, so no change to the current status quo.