Cyanotoxin which is why they are usually green or blue. Cyanobacteria are found almost everywhere; in oceans, lakes and rivers as well as on land. They flourish in Arctic and Antarctic lakes, hotsprings and wastewater treatment plants. They even inhabit the fur of polar bears, to which they impart a greenish tinge. Cyanobacteria produce potent toxins, but they also produce helpful bioactive compounds, including substances with antitumour, antiviral, anticancer, antibiotic and antifungal activity, UV protectants and specific inhibitors of enzymes. Cyanotoxins are often implicated in what are commonly called "red tides" or "harmful algal blooms". Lakes and oceans contain many single-celled
Great Lakes and Ohio River Division Great Lakes and Ohio River Division The United States Army Corps of Engineers Great Lakes and Ohio River Division (LRD) is one of the eight permanent divisions of the Army organization, providing civil works and military water resource services/infrastructure. It also supports economically viable and environmentally sustainable watershed management and water resources development in its territory. The Division, headquartered in Cincinnati, Ohio, covers the American industrial heartland, stretching from the St Lawrence Seaway, across all of the Great Lakes, down the Ohio River Valley to the Tennessee and Cumberland Rivers. It covers , parts of 17 states, and serves 56