On August 7, the Canadian Food Inspection Agency warned consumers not to eat certain mussels harvested from Saltspring Island (British Columbia). The mussels were thought to be contaminated with the Diarrhetic Shellfish Poisoning biotoxin (DSP) called okadaic acid. The affected mussels were harvested by Island Sea Farms Inc. from the harvest location “Area: BC 13, Sub Area: 15”or “BC 13-15” between July 19 and August 2, 2011. Filter feeding shellfish, such as cockles, mussels, and oysters, feed on microscopic algae. Some types of algae, when concentrated, can make the shellfish poisonous to people. The shellfish themselves are not usually harmed. Okadaic acid causes stomach ache and diarrhea when eaten in large amounts.