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Ohio State University professor Jeff Reuetter sticks his hand into a blue-green lagae, microcystis at Gibraltar Island that sits in the harbor at Put-in-Bay on South Bass Island in Lake Erie in 2011. It can produce a toxin, microcycstin, that can sicken people and kill dogs. (Ohio Sea Grant )
Foam and algae in Lake Erie at Ohio's East Harbor State Park in Ottawa County in September 2011.(Ohio Sea Grant )
Micocystin, a toxic blue-green algae, in Sandusky Bay in 2011 during worst-ever algae outbreak on Lake Erie.(Ohio Sea Grant )
A warning sign at a beach in Fairport Harbor in 2013 tell visitors to avoid swallowing the water and avoid water that looks like spilled paint, has surface scum, mat or film, is discolored or has color sreaks and/or green globs floating below the surface. (Bob Downing/Akron Beacon Journal)