Mussel beds cannot be the key in an ecosystem that needs protection, and at the same time be fished upon in large quantities. Yet this was the core mistake in the Dutch policies for the wetlands. Backed up by a tough fight in the courts, a lobby was set up to change the nature of mussel fisheries in te Wadden Sea. Hidde developed a concept of gradual change, accepted by all parties, making the annually fished volumes dependend on the health of the ecosystem. Ultimate goal is protected mussel beds and a sustainable mussel sector.