Stations in the eastern Gulf of Finland where round goby, Neogobius melanostomus, was sampled within 1998–2019 using multi-mesh gillnets (Gn, grey dots) and a beach seine (Bs, black dots) between 2010–2019. Stations, where the round goby was caught, are numbered and marked with circles: 1n–15n are the gillnet stations, 1b–9b are the beach seine stations. Years indicates sampling periods.