Summary:

Work shows the results of research and observation of Drawa river basin in 2007-2009. We found that the study area are highly exposed to anthropogenic impact. As the main sources of adverse changes in the aquatic environment were: flow of agricultural and urban sewage into the waters, over-fertilization of soils and the large number of hydraulic engineering constructions hinder or completely prevent fish migration. The problem relates specifically to trout and salmon, for which the only one tributary - Płociczna is dam-free river, although in the upper parts of the river are also hindering the migration of fish. This also applies to its major tributaries: Młynówka and Cieszynka.