<i>Kessler gobies</i> (IMAGE) Technical University of Munich (TUM) Caption Kessler gobies and other goby species from the Black Sea originally came to Bavaria via the ballast water of the ships and are today strongly represented in the Danube and Main rivers Credit J. Geist/ TUM Usage Restrictions Free for publication in the context of reporting on this topic and if copyright is mentioned. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.