News total of 61 individuals of the long-wristed hermit crab Pagurus longicarpus were found at nine stations in the Meldorf Bight. Usually the long-wristed hermit is native to the east coast of North America [...] marine areas or they are introduced - mostly by human activities. In the case of the long-wristed hermit, we assume an introduction, as the large-scale coverage of the DYFS along the German coast shows [...] so far only occurred very locally. The most likely vector for the introduction of the long-wristed hermit is the release of ballast water by ships. In the past, species have in this way often been introduced