Subtitles section Play video Print subtitles fishing is proving a key point of tension as last minute talks continue between the EU and Britain over a post Brexit trade deal. Fishing alone was just not point north 3% of Britain's economic output in 2019 but it is an emotive subject for Brexit supporters. They see it as a symbol of the sovereignty that leaving the EU should bring. UK. Prime Minister Boris Johnson has insisted on the so called taking back control of UK waters, while the EU wants to keep access to it. In France, British waters are crucial on being locked out Would cause trouble for French President Emmanuel Macron. Fish will be high on the agenda as post Brexit trade talks continue on Friday. Other areas of debate include economic fair play on agreeing ways to settle future trade disputes. There has been some recent progress on state aid rules, but fish remains the toughest issue to solve. What's at stake is a deal that would govern nearly a trillion dollars in annual trade.