The EU fisheries position is simply that the UK gets no special favours. The problem the UK faces is that the fish they catch are varieties that are mostly sold to European markets because UK consumers don't want them. Now they want the benefits of their own fisheries policy and to somehow magically get free access to the EU market to sell those fish they catch.

Oh, and a large chunk of the fishing rights to those waters were sold by UK fishermen to EU fishermen several decades ago.