Image caption, Laurent Merlin (L) inherited his fishing boat from his father
British waters are also familiar toLaurent Merlin as the home port of Boulogne-sur-Mer.
His family have worked freely in British waters for generations but, almost a year after Brexit, he is one of 180 French fishermen still awaiting the new license he needs to get there. fishing.
"We are in a constant state of anxiety and anger ", Mr. Merlin told Hfrance.fr. "We wait until Friday, then we will begin to organize to attack.
His little fishing boat, floating beside the rusty l dock while the crew unloads the catch, has been inherited from his father.
The discourse in ports like Boulogne-sur-Mer this week is blockaded, because negotiations and political pressure fail to deliver results quickly enough for men like Laurent Merlin.
"We 'll create as much disruption as possible, blocking the things Britain needs most," he said.
"We saw [the impact of the] gas shortage; we will try to create another shortage of something else. We are ready to block everything: Calais, Dunkirk, the Channel Tunnel. We need this fishing license and we will do everything to get it. "
Benoît Firmin, director of the local fishing committee, says the fishermen here in France get a lot of support from their people. counterparts from other EU countries like Ireland and Belgium.
If the blockade continues, he says, it will likely be larger than the port of Boulogne; and target Christmas supplies. "We 'haven't even blocked off yet, " he said, "and there is already a shortage of food, gas and staff [in the UK] . "
The French Minister of Fisheries, Annick Girardin, supported by ten other EU countries, this week challenged Britain's demand for boats to prove their historic presence in British waters, and called the UK's response "incomplete and inappropriate".
OIivier Leprêtre, himself a fisherman, is president of the regional fishing community of Hauts-de-France.
The obligation for fishermen to justify their presence in British waters between 2012 and 2016 is very difficult, he said, because small boats didn't have the equipment back then.
"From the start we said the fishery would be the variable adjustment of Brexit, and that turned out to be true " he told us. " We feel like the punching bag between Europe and the UK.
The government here has promised responses from Brussels and Paris within the next two weeks, including - he says - d 'possible French reprisals by reducing Jersey's electricity supply.
In parliament last week, French Prime Minister Jean Castex called thequarrel over licensing a matter of principle that went beyond fishing. It was, he said, to get the British to "keep their word ".
This is a pointed comment here for now; the EU is at an impasse with Britain over post-Brexit rules for Northern Ireland, and the French Home Secretary has complained that - regarding the fight against illegal immigration - the UK is not paying what it owes.
Off Boulogne -on-sea, seagulls fight over fish remains left by French boats.
The battle for resources in this thin strip of sea is fierce; but with cross-Channel tensions already strong and French presidential elections scheduled for next year, it is an equally fierce battle on earth.