Introduction aux problèmes socio-économiques de la mariculture extensive : expériences japonaises

The term "extensive mariculture" covers two main types of production : the exclusive territorial right based aquaculture of fixed species and stock enhancement based fisheries. The releasing of juveniles, with or without the supply of adequate habitat, is presently the main form of stock enhancement. Japanese experience shows the difficulty to clearly assess the benefits of marine ranching, and then to ensure its management. Some of the main aspects of this management are presented here : public and private costs-benefits analysis, the relation fishing/aquaculture/sea-ranching and the role of collective organization for management.