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The location (a), bathymetric map and position of sampling stations in Sztynorckie Lake (b) [PZ—Profundal Zone (station 4), MZ—Mooring Zone (station 5), FZ—Fuel Zone (station 3), IZ—Inflow Zone (station 1), CZ—Canal Zone (station 2)] (own elaboration based on IFI43 and Greala et al.44).