The demand for sea products is going only to increase in the years to come. Capture fisheries will not be enough (80 million tons / year) to supply and fish farming (38 million tons of products o fthe sea in 1998) already stands out to itself as a dominating actor. One of the missions of Ifremer in the field of the fish farming is the harmonious development of the field by mastering possible impacts due to rearing. The Institute developed competence in immunology, physiology, genetics, pathology and food. This study report of impact on the useful bases of physic and biology to elaborate the impact studies in marine fish farming, within the framework of the french law on the Classified Installations for Environmental Protection (ICPE), confined in the Meditenanean Sea, was realized on the request of the SFAMN (French Syndicate of Marine Aquaculture). It is the occasion to make an inventory of fixtures about the types and the modes of marin fish production on this coastal zone. This document proposes a set of parameters, wide enough so that fish farmers can elaborate a study of impact adapted to their exploitation and to the site o ftheir installation. More a strategy and a model is proposed to follow the evolution of the impact from the fish farm and help in the implemented of a marine fish farming respectful of the environment. An application of the estimation ofthe impact of the marine fish breeding is made for the whole fish farming of the Region Provence Alpes Côte d'Azur (PACA) in touch with the other contributions in nitrogen and phosphorus in the coastal zone.