Cyanobacteria – these harmful micro-organisms called “blue seaweeds” – are proliferating in Ile-de-France. Following the different heat waves and scorching temperatures that improved their development, making swimming forbidden in different lakes and outdoor activities centers in Ile-de-France, be careful, especially for animals and dogs who love jumping into the water. As a matter of fact, cyanobacteria can be deadly for your pets and make fishes not suitable for consumption.