An algal bloom caused mass deaths of fish and other animals in the river Oder in Germany and Poland in 2022, and scientists warn there is a high risk of a second catastrophe
An algal bloom that killed hundreds of thousands of fish in the river Oder between Germany and Poland in 2022 could reappear this summer with devastating consequences, scientists have warned.
But now the alga is present in the waters, a fresh bloom could appear in the Oder or nearby rivers if conditions are right, scientists fear. Discharges of salty wastewater from industrial sites near the Gliwice canal then caused a surge in the river’s salt levels, allowing the algae to bloom. It is unclear whether the discharges were illegal or within the permissions granted under permits, says Free. Polish records suggest at least 34 facilities in the Oder catchment have a licence to discharge salty waste.
A spokesperson for Germany’s environment ministry said in a statement authorities were only notified about the incident on 11 August, after fish had already washed up dead downstream inside the country’s borders. It said the international alert system for pollution incidents was being revised, adding: “In the future, it shall be even clearer that also in events like for instance a fish die-off, a transboundary and timely warning shall be released.
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