Anabaena is a type of cyanobacteria, commonly referred to as blue-green algae, that can form floating mats or scums on the surface of lakes and ponds. Often observed as blue or green in color, this cyanobacteria thrives in warm, nutrient-rich waters, especially during late summer and early fall. In addition to impacting water clarity and aesthetics, Anabaena has been linked to human and animal illnesses, often resulting in symptoms such as vomiting, diarrhea, and abdominal pain. Some species can produce harmful toxins that pose risks to fish, wildlife, and even drinking water supplies. Managing nutrient levels and promoting healthy water circulation are key strategies for controlling Anabaena growth and maintaining a balanced aquatic ecosystem.