The seas and oceans form integrated ecosystems giving life to many species and represent food and socio-economic benefits sources for millions of persons around the world. Unfortunately, nowadays these sources suffer from marine pollution which becomes a major problem that has negative effects on all of the planet's marine ecosystems. In the bay of Monastir (center coast of Tunisia), as many parts of the globe, economic development has been most active in this coastal zones, especially textile industry, fishing and aquaculture activities, putting enormous pressures on this coastal ecosystem. In this study, we tried to collect informations about the impact of marine water pollution in the bay of Monastir from sea users (fishermen, professional or not), and we tried to identify the main zones of pollution that may be potential zone for the intervention of protected area managers in the future.