2011 Lake Eerie Algal Bloom (image) Carnegie Institution Caption This NASA Landsat-5 image shows the record-breaking algal bloom in Lake Eerie in October of 2011. The green scum is mostly microcystis, a toxin to mammals. Credit NASA Usage Restrictions Public domain, but not for commercial use Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.