The indicator represents the Red List classification of the fish species found in Berlin’s water bodies. The fish fauna of Berlin’s waters includes a total of 44 cyclostomes and fish species, of which 36 are native fish species. A total of 35 of the native fish species were assessed (all except the eel). The data comes from a report by the Senate Department for the Environment, Transport and Climate Protection, which was compiled in cooperation with the Leibniz Institute of Freshwater Ecology and Inland Fisheries.