Lakes Czajcze, Domysławskie, Grodno, Kołczewo, Koprowo, Liwia Łuża, Rabiąż, Resko Przymorskie, Warnowo, Wisełka, and Żółwińskie were studied in 1981-2000. All the lakes were found to be non-resistant or poorly resistant to degradation. deposited in The respective catchments of the lakes studies had an average potential to mobilise nutrient loads, a particularly high potential being shown by the Lake Resko catchment. All the lakes studied were found to undergo intensive eutrophication. Depending on a classification system used, they can be regarded as eutrophic, hypertrophic, strongly eutrophic, or eutrophic bordering on hypertrophic. The least eutrophic was Lake Grodno. The eutrophication of the lakes is confirmed by their respective summer oxygen regimes which are characterised by hyperoxygenation (180-200%) of surface water and oxygen depletion in the near $ndash; bottom layer.

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