Direction des Ressources Marines;Ifremer (Institut Francais de Recherche pour lExploitation de la Mer);Ifremer (Institut Francais de Recherche pour l'Exploitation de la Mer)
The invention relates to a nucleus coated with a film comprising one or more exopolysaccharides (EPS) and optionally one or more bioactive molecules such as bactericidal or bacteriostatic agents, cicatrizing agents and/or anti-inflammatory agents, as well as to a method for obtaining said nucleus, in order to inhibit graft rejection in pearl oysters.