Back to profile Contact person for... - dr. A (Alwin) Hylkema News Alwin Hylkema on the RAAK PRO Diadema project to restore sea urchin populations in the Dutch Caribbean 8 oktober 2020 | Alwin Hylkema on the RAAK PRO Diadema project to restore sea urchin populations in the Dutch Caribbean - WUR category_news Alwin Hylkema on the RAAK... Designing an optimal artifical reef 10 september 2020 | In his PhD, Alwin Hylkema is asking what type of artificial reef structure type is most effective in increasing fish density around Saba and St.... Previous12