Blue-green algae control and prevention

Blue-green algae: recognition, health and environmental consequences, and natural control methods for a healthy pond and safe water.

What is blue-green algae?

Blue-green algae, also called cyanobacteria, are not actually true algae. They are microscopic bacteria that live in freshwater and can bloom under certain conditions. When blooming, they can turn the water a blue-green to green-black color and are often accompanied by an unpleasant odor.

How do you recognize blue-green algae?

Blue-green, sometimes greenish-black floating layers on the water can be identified. It sometimes looks like a paint-like layer floating on the surface of the water. In addition, the water can give off a foul-smelling odor, similar to rotten eggs.

What are the effects of blue-green algae?

Blue-green algae produces toxins that can be harmful to humans and animals. Contact with or ingestion of contaminated water can cause skin irritation, eye irritation, headaches, gastrointestinal problems and, in severe cases, even liver and nervous system disorders. It is also harmful to aquatic life; the algae can cause oxygen depletion in the water, which can kill fish and other aquatic animals.

Fighting blue-green algae naturally

A natural way to combat blue-green algae is to promote a healthy pond ecosystem. This can be done by placing enough oxygen plants, which compete with the algae for nutrients. In addition, it helps to limit the supply of nutrients (such as nitrogen and phosphate), such as by using rainwater instead of tap water. It is also important to regularly clean the pond and remove excess organic material, such as leaves and dead plants. Good water circulation can also help prevent algae blooms.