This part of sea is polluted by different entities. We can look for the industry like Alteo and his red mud, fishermen with trawlers seeping seabed, and people who throw lot of plastics and other wastes. It is necessary to not degrade for many reasons, for example these coastal areas are made up of numerous habitats such as seagrasses, mudflats or rocky banks and can serve as a nursery and ensure the renewal of several marine organisms such as fish. So it is important to preserve and restore the marine environment to continue to benefit from theses ecosystemics services . An example of restoration project is the nappex project which mean artificial nursery for examplary port. The principe is simple it is a a steel cage filled with a recylcled material, associated with another cage, empty this one, which protects larvas and young recruits when, assaulted by predators they try to get closer naturally to the housing environment. The problem is due to the design of ports, with their right quays, in fact a real trap for these post- larvas which find themselves unprotected in front of predators. However, this interface zone is crucial in the life cycle of a large majority of fish species and also offers humans a very large number of ecosystem services.Since long impacted by various coastal developments, it is now necessary to act to try to restore, rehabilitate or reassign these environments.