An aerial view taken on December 6, 2017 shows French oyster farmer Didier Dubos (front) working at the Courbey oyster farm in Arcachon Bay off Gujan-Mestras. 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 chromosomes. / AFP PHOTO / MEHDI FEDOUACH