paper: The Caucasian dwarf goby, a new alien Gobiidae spreading at the Lower Rhine, Germany authors: Jost Borcherding, Dominik Aschemeier, Jacqueline Bruhy, Lisa Heermann, Jan Lindner, Sophia Lara Schröder, Katalin Wagner, Stefan Staas description of files: 1. BeachSeiningNetCatches_LowerRhine.csv: The table contains basic information about the fish species that where caught during beach seaning in the side channel Bislich-Vahnum (SCBV) in September 2020. 2. StomachContentAnalyses_Goby_LowerRhine.csv: The file contains the results of all stomach analyses that where performed on all gobies caught during the 2020 beach seaning.