The Agreement on the Conservation of Seals in the Wadden Sea, enforced in 1991, prohibits the killing or harassment of seals in the Wadden Sea, specifically targeting the harbor seal population.
O Acordo sobre a Conservación de Focas no Waddenzee, que entrou en vigor en 1991, prohibe matar ou acosar as focas no Waddenzee, especialmente a poboación de Phoca vitulina.