Netherlands, Uitgeestermeer, Blue-green algae, due to the warm weather last month, in many places a lot of Blue-green algae has grown. Blue algae is a cyanobacteria and occurs in fresh and brackish water, temperature and the presence of fertilizers such as nitrates and phosphates accelerate the growth..© 3 aug 2018 Marco van Middelkoop/Aerophoto-Schiphol