Photo: NewsLubuski/East News Polish firefighters pick up dead fish from the Oder river near the village of Cigacice on August 13, 2022 in western Poland ca. 50 km from the German border. In recent days thousands of dead fish have been found in various parts of the second largest Polish river - Oder. Polish authorities are trying to establish the source of the possible toxic pollution, which kills not only fish but other water animals i.e. beavers. On a stretch of almost 200 kilometres, Oder is a natural border between Poland and Germany.