Cyanobacteria, commonly known as blue-green algae, are microorganisms naturally present in bodies of water, including Lake Achigan. However, when conditions are favorable, they can multiply rapidly and form visible blooms on the surface of the lake.

A phenomenon linked to water quality

Cyanobacteria blooms are generally associated with high concentrations of nutrients, particularly phosphorus, from soil runoff, inadequate septic systems, fertilizers, and riverbank erosion. Warm periods, combined with stagnant and poorly renewed water, also promote their growth.

Health and environmental risks

Some species of cyanobacteria produce toxins (cyanotoxins) that can pose a risk to human and animal health. Contact with contaminated water can cause skin irritation, gastrointestinal problems, or, in some cases, more serious effects. Consuming water or fish from an affected area can also be dangerous.

From an ecological perspective, these blooms reduce the oxygen available in the water, disrupt aquatic habitats and harm the biodiversity of the lake.

Prevention and best practices

The fight against cyanobacteria relies primarily on reducing nutrient inputs into the lake. To achieve this, it is essential to:

• Maintain vegetated riparian strips;

• Ensure the proper functioning of septic systems;

• Limit the use of fertilizers and pesticides;

• Reduce soil erosion;

• Adopt environmentally friendly practices.

Role of APLA

APLA monitors water quality, raises awareness among local residents and collaborates with regional partners to prevent and limit cyanobacteria episodes.

Through collective and responsible action , it is possible to preserve the health of the lake and ensure a safe environment for all .