Nutrient Balance of North-Eastern Poland Lakes

In order to determine the nutrient balance two groups of the lakes were selected: ten flow lakes, namely, Mielenko, Karczemne, Klasztorne Male, Klasztorne Duze, Paslek, Wymoj, Sarąg, Łeguty, Isąg and Suskie (located in Olsztyn Lake District and Kashubian Lake District), and ten non-flow lakes, namely, Czarne, Dlugie, Podkowka, Starodworskie, Sukiel, Track, Tyrsko, Kepijko, Paskierz and Podąbek (located in Olsztyn Lake District and in Ilawskie Lake District).