The Northern Adriatic Sea, shaped by the interplay of fresh and saltwater influences, supports a growing blue economy, including fisheries and aquaculture. Despite multiple EU directives (WFD, MSFD, MSPD) and sectoral policies, biodiversity considerations often remain insufficiently addressed. This case study engages basin authorities, regional administrations, environmental agencies, and NGOs to pinpoint governance gaps and strengthen coordination. The goal is to ensure sustainability, protect biodiversity, and support the EU Green Deal’s environmental objectives in this sensitive coastal region.