Massachusetts fisheries officials have closed a portion of Cape Cod to all shellfish harvesting because of red tide and higher levels of toxic algae.
The Division of Marine Fisheries announced Thursday that the toxic algae bloom has forced the closure of sections of the Nauset Marsh System in Orleans and Eastham, including Nauset Harbor, Mill Pond, Town Cove and Salt Pond.
A previous closure order for the area last month only applied to blue mussels.