Algae blooms are caused by 3 elements: excess nutrients, too much sunshine as well as reduced oxygen degrees. Nutrients come from a variety of sources, many notable fish and also pet waste, fish food as well as dead/decaying vegetation. Other sources would certainly consist of fertilizer run-off and also run-off from close-by ranches and also pastures. All these sources give much needed nitrogen and phosphorus that algae should flower as well as grow.