ABSTRACT : The Mediterranean coast of the Languedoc-Roussillon is composed of about twenty rich lagoons with exceptional flora and fauna , around of which urban and touristy poles are in development The naturals and anthropogenics characteristics provoke notably for multiple practices recreational. It has been submitted since many decades, to a strong demographic pressure. Professionals activities (fishing,...) and recreation (seaside, yachting,...) abut and offer a complexed social environmental and often conflicting. On certain coastline, leisure activities increase the risks that get necessary to be controled. This communication propose to supply some reflections on the conditions of realisation, and utilisation of the results on two activities studies for allow us a better knowledge of practices, and to quantify persons on the two dissimilars littoral spaces. This studies propositions from search party have sparked off various interests of administrators that it is interesting to study. The return on this iterative and analytic approach participate at an agreement and disagreement of practices diagnosis and perception in relation to the regulation on this places. KEY WORDS: Integrated Coastal Zone Management, Coastal Languedoc-Roussillon, Activity studies, Co-construction and knowledge transfer, Scientists, administrators
