Rachael Boyle, Phillips-Rooks District Extension Agent Agriculture and Natural Resources
Harmful algal blooms, or HABs, refer to a dense growth of algae with the potential for creating toxins or other nuisance compounds. In freshwater, most HABs are composed of blue-green algae, also known as cyanobacteria. Although blue-green algae are a natural part of water-based ecosystems, they become a problem when nutrients (phosphorus and nitrogen) are present in concentrations above what would naturally occur. Certain cyanobacteria can produce harmful toxins, such as microcystins, nodularin, or anatoxin.