Following an escalating dispute over post-Brexit fishing licences issued last week – which on Thursday culminated in a blockade of Jersey's Harbour by French fishermen – the La Manche authorities have officially notified the government that Jersey vessels will not be allowed to land their catch in the region until further notice.
It is understood that the ports include Granville, Barneville-Carteret and Dielette.
The majority of shellfish caught by local fishermen is exported to Europe.
External Relations Minister Ian Gorst said: 'We regret this action and don’t believe it is compliant with the terms of the Trade and Cooperation Agreement. For that reason we will refer the notice of this decision immediately to the European Commission.'