Fishermen are calling for Royal Navy protection after claims they were attacked by French vessels.
Kevin Lochrane said his boat was surrounded by seven or eights boats in international waters 15 miles off Caen in a dispute over scallop beds.
One Scottish fisherman, Andy Scott, said he feared for his crew's safety during the incident.
Other crewmen, including from Devon, said they were also surrounded by the French fishermen.
They said the French fishermen had tried to damage their gear.