More than 10 tons of fish have been found dead in a European river since late July — an unexplained “ecological catastrophe” that is baffling scientists and political leaders alike.
Germany and Poland are working together to solve the mystery behind the mass die-off in the river Oder, which flows between the two countries.
The Oder, known as Odra in Polish and Czech, runs from Czechia to the Polish-German border before flowing into the Baltic Sea. It is one of the biggest rivers in Poland.
The continent is suffering what experts say could be its worst drought in 500 years, with major rivers from the Danube to the Rhine drying up.
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