WELLFLEET, MA - JUNE 13: Little neck clams that farmers are prohibited from harvesting are shown June 13, 2005 in Wellfleet, Massachusetts. Farmers in Welfleet Harbor are not being allowed to harvest shellfish because of an outbreak of algae bloom known as red tide, called the worst in decades by marine officials. States officials from Massachusetts to Maine have closed shellfish grounds in response. The algae does not harm oysters or other filter feeders like clams and mussels, but can cause serious illness among humans that injest the infected shellfish. (Photo by Jodi Hilton/Getty Images)
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