Blog Post Image: Researchers Issue Forecast for ‘Moderate’ New England Red Tide in 2013

When shellfish accumulate dangerous toxins after filtering algae from water as food, public health is at risk. State and federal agencies monitor these shellfish for biotoxins and close affected areas, posting signs like this. Note that although the water appears clear, there is a danger present. (Photo by Judy Kleindinst, Woods Hole Oceanographic Institution)