French oyster farmer Didier Dubos (L) watches as his colleague Michel rakes the sand to remove holes left by rays, which eat oysters, before scattering young oysters on the sand at the Courbey oyster park in Arcachon Bay on December 6, 2017. French oyster farmer Didier Dubos only harvests diploid oysters, with two sets of chromosomes, and is worried about the lack of information regarding the harvest of triploids, which have been modified in laboratories and have three sets of chromosomes. / AFP PHOTO / MEHDI FEDOUACH