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Poland investigates ‘ecological catastrophe’ of fish die-off

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead chub and other dead fish are swimming in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

A dead fish drifts in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes drift in the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fishes lie on the banks of the Oder River near Brieskow-Finkenheerd, eastern Germany, Thursday, Aug. 11, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland. (Frank Hammerschmidt/dpa via AP)

Dead fish float in the shallow waters of the German-Polish border river Oder near Genschmar, eastern Germany, Friday, Aug. 12, 2022. Huge numbers of dead fish have washed up along the banks of the Oder River between Germany and Poland, sparking warnings of an ecological disaster but no clear answers yet about what the cause could be. (Patrick Pleul/dpa via AP)

Poland investigates ‘ecological catastrophe’ of fish die-off