Oscillatoria is a filamentous cyanobacteria that forms small, spongy masses on the bottom of ponds and lakes before eventually floating to the surface. It is often dull gray in color and can be difficult to control once established. This troublesome cyanobacteria thrives in nutrient-rich waters and can contribute to poor water quality, including oxygen depletion and toxin production in some cases. Managing nutrient inputs and promoting water circulation are key strategies for preventing excessive growth and maintaining a balanced aquatic ecosystem.