An aereal picture taken on August 15, 2022 shows a floating damm used to encircle dead fish on the river Oder and an escavator to remove them in Krajnik Dolny, north-eastern Poland. - Polish firefighters said on August 16, 2022 they had recovered 100 tonnes of dead fish from the Oder river running through Germany and Poland, deepening concerns of an environmental disaster, as the cause of death is uncertain. The first reports of mass fish deaths were made by Polish locals and anglers as early as July 28. (Photo by Marcin BIELECKI / AFP)