Stock Photo - 18 December 2023, Brandenburg, Potsdam: A small grayling swims around in a tank at the aquarium of the Potsdam Natural History Museum. Following the reopening of the aquarium at the Potsdam Natural History Museum in November, the number of visitors has increased significantly. Almost 40 native fish species are on display in the museum's aquarium. Photo: Michael Bahlo/dpa. - Potsdam/Brandenburg/Germany

Stock Photo: 18 December 2023, Brandenburg, Potsdam: A small grayling swims around in a tank at the aquarium of the Potsdam Natural History Museum.

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