The Prime Minister insisted Brexit means leaving the hated Commons Fisheries Policy (CFP).
Nicola Sturgeon and other senior SNP figures have claimed the UK Government is planning a “fisheries sell out” in divorce talks with Brussels.
In 2007 the SNP stood on a platform to withdraw completely from the rules but this was later watered down in 2016 with calls for “decentralisation”.
Mrs May said: “A vote for the SNP is a vote for the Commons Fisheries Policy.”
She also said the Tories’ new Shared Prosperity Fund to replace EU economic aid would be distributed across the four home nations to tackle inequalities.
The comments come after fisheries spokesperson Mike Hookem bemoaned the lack of “balls” from successive governments to stand up for the country’s fishing industry.
Speaking in Westminster as the policy was launched, a passionate Mr Hookem said Theresa May is “poised to betray” the UK’s fishing industry.
He said: “I demand the Government make fisheries a red line in the coming negotiations.”