Stock Photo - 01 January 2021, Brandenburg, Potsdam: The long-spined hogfish (Diodon holocanthus) Emma swims in an aquarium during a press tour for the annual review of the tropical hall ""Biosphäre Potsdam"" . With a symbolic animal count, the staff of the Tropical World brought the past months to a close. There are now several thousand animals of 150 species to be seen in the Biosphere - including birds, butterflies and monkeys, as well as insects, fish, corals and annemones. To save energy, the temperature in the hall was lowered from 28 degrees to 24 degrees Celsius. Photo: Soeren Stache/dpa. - Potsdam/Brandenburg/Germany