EN
97 aquatic beetle species were collected in the years 2006 and 2007 in three faunistic regions in the NE Poland (Baltic Coastline, the Mazurian Lake District, Podlasie). The most interesting species were as follows: Brychius elevatus, Deronectes latus, Helophorus pumilio, Hydrochus ignicollis, Spercheus emarginatus and Ochthebius flavipes. Four species have been recorded for the first time in the regions. First records of six species from the Pomeranian Lake Districts are also given.