Les outils géomatiques pour des applications de gestion du secteur ostréicole. CoastGIS'97

In Marennes-Oléron, Héral (1986) described the relationship between the annual production and the oysters' biomass over a century. His conclusion is that the drop in the growth of oysters was caused by an "overstorage" considering the trophic capacity of the basin. Moreover, the large intertidal spaces, though providing a great opportunity for mollusc culture, suffer from a large bio-deposition (Sornin 1983) which tends to intensify the sedimentation of the basin. The spatial management of oyster culture could be a key factor for its long-term development. In collaboration with the French Marine Affairs, in charge of the cadastral management, the IFREMER has developed a geographical information system enabling the gathering under the same geographic referential of various data such as bathymetry, positioning of concessions, biological measures, sediment type, but also regulations, hydrodynamic and trophic model results, etc... A cross-analysis of these different layers provides more argued choices for a better use of the environment and space.