What are harmful algal blooms (HABs)?

HABs are algal blooms with the potential to harm human health or aquatic ecosystems. In freshwater systems, cyanobacteria (also called blue-green algae) are microorganisms that can produce HABs. Some cyanobacterial HABs, or cyanoHABs, can produce toxins (cyanotoxins) that are harmful to human and aquatic health.

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1. What are harmful algal blooms (HABs)?
2. What causes HABs?
3. What are the potential effects of HABs?
4. How do I know if a HAB is occurring?
5. What to do if you notice a HAB?