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What problems do blue-green algae cause?

  • They can adversely affect the appearance, quality and use of the water. The water may be discoloured green, blue-green or greenish brown and several species can produce musty, earthy or grassy odours.
  • Blooms can also cause foaming on the shoreline which is sometimes confused with sewage pollution.
  • When blue-green algal blooms die and decay, they use up oxygen in water which can kill fish and other aquatic life.
  • Some blue-green algae can produce toxins. In high enough concentrations these toxins can kill wild animals, farm livestock and domestic pets. They can also be harmful to human health.