GIULIA PARAVICINI THOUSANDS of protesters demonstrated in the Mauritius capital Port Louis on Saturday to demand an investigation into an oil spill from a Japanese ship and the mysterious death of at least 40 dolphins that have been found near the site of the spill. Environmentalists have called for an investigation into whether the dolphins died as a result of the spill caused when the bulk carrier, the MV Wakashio, struck a coral reef last month. One protestor held a banner with a dolphin covered in oil reading "our lives matter" and another held one calling for the government to…