this is despite the region having some of the strictest rules in place, with up to 21 days quarantine required. the fishing industry in southern france is becoming increasingly concerned about the spread of a foreign invader. over the last four years, more and more blue crabs have been found in the mediterranean. originally from the north atlantic, they are consuming fish stocks and damaging nets. the bbc�*s tim allman has the story. yves and jean—claude have been fishing these waters for years. they normally make their living from catching eels but in recent years, their haul is mostly full of crabs — lots and lots of crabs. translation: since there are crabs, - we no longer catch eels and, as long as we no longer catch eels, we no longer have any income. it is worse this year. last year we caught a few eels but this year nothing, nothing, nothing. the crab is all over