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The upper part of sediment core from (Z)abi(n)skie Lake (the Masurian Lakeland,Northern Poland) covering the last 250 years was analysed for diatoms.(A)abi(n)skieLake is a dimictic, highly eutrophic lake with low water transparency and pH of water in hypolimnion ranges from 6.9 to 8.0.The sediment samples for quantitative and qualitative diatom analysis were taken at each varve.The diatom samples were prepared according to the standard methods (Battarbee 1986) and performed using a NIKON microscope, using a 100x oil immersion objective.