Cyanobacteria can produce toxins and other irritants that can cause several health effects in people and animals, including pets and livestock. Health effects include rashes, itching, numbness, fatigue, disorientation, abdominal pain, vomiting, and diarrhea. In extreme cases, cyanotoxins may lead to wildlife, pet, or livestock death. Blooms may also cause fish kills due to depleted oxygen levels, create issues for drinking water supplies and agriculture, and lead to tourism and property value losses. More information on HCB-related health effects for people and animals: Center for Disease Control and Prevention.