Stock Photo - Cyanobacteria cover the surface of the Svratka River in Brno, Czech Republic, October 5, 2023. The river level in the vicinity of the Brno dam turned green in warm and dry weather shortly after the Morava River Basin stopped adding ferrous sulphate to the dam. Ferrous sulphate binds phosphorus and cyanobacteria cannot use it as a nutrient. (CTK Photo/Patrik Uhlir)

Stock Photo: Cyanobacteria cover the surface of the Svratka River in Brno, Czech Republic, October 5, 2023. The river level in the vicinity of the Brno dam turned green in.

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