On Saba and St Eustatius, Diadema are abundant on a few locations and their positive effect on the reef is clear. The objective is to restock Diadema Antillarum sea-urchins population on reefs within the Saba Marine Park, Saba National Park and St Eustatius Marine Park. All parks are members of the regional network of the Dutch Caribbean Nature Alliance. By doing so, it will reduce macroalgae cover and stimulate coral cover. It will consequently serve to help 300 m² of coral reefs to continue to fulfil their ecological and economic role in the future. Research universities will help implement the project, i.e.: (University of Applied Sciences Van Hall Larenstein (VHL) and Caribbean Netherlands Science Institute (CNSI).