This photo of the record-setting 2011 Lake Erie algae bloom was taken in August of that year along the southeast shore of Pelee Island, Ontario. Photo by Tom Archer.

A Lake Erie algae bloom in September 2009. This photo was taken on the southeast shore of Pelee Island, Ontario. Photo by Tom Archer.

A satellite image of Lake Erie on Sept. 3, 2011, overlaid on a map of the lake and its tributaries. This image shows the bloom about six weeks after its initiation in the lake's western basin. On this date, it covers the entire western basin and is beginning to expand into the central basin. Map by Michigan Sea Grant.