Two more shellfishing areas that had been off limits after Hurricane Sandy have reopened. The Rhode Island Department of Environmental Management said Wednesday that shellfishing areas in Potters Pond in South Kingstown and the part of Ninigret Pond in Charlestown known as Fort Neck Pond are again safe for harvesting. The decision was made after water-quality tests on samples collected earlier this week. Shellfishing areas in Quonochontaug Pond and portions of Winnapaug Pond and Ninigret Pond were opened Tuesday. Waters of Winnapaug Pond in Westerly will remain closed because of unacceptable water quality.