Theresa May starts the formal process to leave the EU today.
There's worries about what impact Brexit talks could have on Grimsby's fishing industry.
It's as Article 50 gets triggered later - which will formally start the UK's exit from the European Union.
Martyn Boyers, chief executive of the fish market, says it would be worrying if tarriffs were introduced.
He also says if Scotland was to vote for independence from the UK, it could affect Grimsby's fishermen.