Within the framework of the action programmes "Rhine" and "Rhine 2020" of the International Commission for the Protection of the Rhine (ICPR), comprehensive surveys of the Rhine fish fauna according to comparable criteria have been carried out along the entire length of the Rhine at regular intervals since 1990 - currently every 6 years. The report takes into account the ICPR monitoring surveys of 2018/2019 as well as selected special surveys between 2016 and 2020, which complement the results of the ICPR monitoring sites in terms of their temporal and spatial data density.
The report is only available in German, French and Dutch.