From the BBC:
“The government wants to hold annual talks on access to UK and EU waters, and on quotas - using a system which works out shares based on the percentage of each species of fish in each EEZ (this is known as "zonal attachment").
That's what other independent coastal states like Norway do. And fishing communities in the UK, which were strong supporters of the campaign to leave the EU, are insisting on this basic change.
But because UK waters are so important, and so bountiful, the EU is under huge pressure from its fishing communities to maintain the status quo.
It wants the UK to grant the same level of access there is now, with only gradual change envisaged, in order to "avoid economic dislocation for EU fishermen that have traditionally fished in UK waters".
The EU also wants to divide up the amounts that each country's boats are allowed to catch in a way that will not be renegotiated every year, and which cannot be changed unless both the UK and the EU agree.
The EU's chief negotiator Michel Barnier has said annual negotiations with the UK would be technically impossible because so many different types of fish would be involved.
But he has also acknowledged that the EU's current position on fishing will have to change.”