In this work analysis and assessment of physico-chemical status and fish structure of the Mała Wełna River for a period of 2000-2009 are presented. Based on the values of oxygen indexes (dissolved oxygen, BOD5 and COD) and biogenic indexes (ammonia nitrogen, nitrate), noted during research period, waters of the Mała Wełna River was classified as moderate quality. Results of the fish structure study carried out on 7 reaches situated along course of the river showed that both abundance and biomass varied among particular measurements points (Shannon's index amount 0.9). Fish population was represented by 18 species, among them in 2008 pike constituted 47% of the biomass but the highest abundance showed sticklebed (32%) Among 18 species occurring in the waters of the studied river 15 of them were classified to a category of lower risk of endanger and 3 as en-danger species. Similar to water quality also ecological status of the river was evaluated as moderate.
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The paper presents the results of hydrochemical tests of the Głębieniec stream, a 4th order, right-side tributary of the Kamienica river. The stream catchment , of mountain character and area of 9.58km2, is situated in the malopolskie voivodship, limanowski county and Kamienica commune. The 81% of the catchment is managed as forest grounds, the remaining area is an extensively used agricultural land. The analyses were conducted in 2011 in five measurement-control points over a stream stretch of 3405 m. The reaction (pH), electrolytic conductivity, concentrations of oxygen saturation and dissolved oxygen were measured in water samples on site, whereas the other quality indices: dissolved solids, NH4, NO3,NO2, PO4, total phosphorus, SO4, Cl, Ca, Mg, total iron, Mn, Na, and K were assessed in a laboratory of the University of Agriculture in Krakow. On the basis of the assessment results the ecological state of the Głębieniec stream water was rates as very good in all measurement-control points. Except for the measurement-control point No.1, the stream water may be used for potable water supply, but it must be first subjected to physical and chemical treatment due to high concentrations of total iron and manganese. Also, except for point No.1 (exceeded nitrite concentrations), ...
