FILE PHOTO: German authorities look for the cause of mysterious

FILE PHOTO: Dead fishes are removed by a worker of the emergency services of the voluntary water rescue organisation, German Life Saving Association (DLRG) from the Oder river on the German-Polish border, as water contamination is believed to be the cause of a mass fish die-off, in Frankfurt (Oder), Germany August 14, 2022. REUTERS/Annegret Hilse/File Photo