French oyster farmer Didier Dubos holds a diploid and a triploid oyster (R), identifiable because of its horn formation, in Gujan-Mestras 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