Sustainable development of these activities is one of the three goals of the Estuaires Picards and Mer d’Opale Marine Nature Park.

For instance, a compostable and biodegradable net has been set up by the Park in partnership with the FROM Nord producers organisation, targeting the sea fishermen. For the onshore fishers, a ruler has been created : it ensures compliance with regulations on minimum sizes for shellfish and crustaceans. A charter of good practice has been drawn up for providers of coastal observation and discovery activities: signatories undertake to respect the good practice gestures to protect seals.