Oddziaływanie Stawów Hodowlanych na Jakość Wody Rzeki Wąskiej
Impact of fish ponds on the quality water in the Wąska river

Summary/Abstract: The aim of the study is to determine the influence of freshwater fish farming on the chemical status of water in the catchment of the Wąska river. The paper presents the results of physicochemical studies of water supplying and discharged from fish ponds at Klekotki. At measurement points located on the Wąska river above and below the ponds the following properties were determined: total nitrogen, total phosphorus and concentrations of dissolved ammonia, nitrates, phosphates, sulphates. The observations showed that the physicochemical state of water supplying the ponds is below good because of too high phosphate concentrations (0.57 mg∙dm–3 above the joints and 0.41 mg∙dm–3 below). In spite of that, it was stated that fish farming can positively affect the water purification process and improve the physical and chemical parameters of water, as evidenced by the reduction of total nitrogen concentrations by 66%, ammonia by 52%, sulphates by 50%, nitrates by 46% and phosphate by 28%, below the discharge of water from the ponds in relation to the supplying waters.

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