Berlin — A river on the German-Polish border has become a mass grave. Volunteers and authorities have been busy for days removing tons of dead fish floating on the surface of the Oder River. The cause ...

Hundreds of fish corpses have been found in Oder-connected canals in Poland, sparking fear of the recurrence of last year's ecological disaster in the German-Polish river. Recent fish deaths in canals ...

Two years after a major fish die off in the Oder River, Poland is again battling algae blooms, this time with hydrogen peroxide. As rising pollution and temperatures fuel their growth worldwide, ...