Natural abundance of fish in rivers is very valuable. So that, according to the Habitats Directive, there is a need to take activitis to preserve or regenerate states conditions characteristic of natural habitats. Main goal of this thesis was determination, in hydraulic aspect, types of habitats for fish living in examinated part of Wisłoka River. Determination was based on actual and changed hydraulic conditions. To determine types of habitat Mesohabitat Evaluation Model was used. It made possibile to classify study area according to six types of different flow conditions. To achieve main goal plenty of surveys were done, for example cross sections stream’s slope and regime were measured. Analysis of the results, hydrologic calculations and model test were also done. Five types of habitats in actual hydraulic conditions, in measured part, were determinated. Because of the new type of rivers bed morphology types of habitat had different spacial order. It is caused because of breaking high speed zones to smaller areas. Zones with calm flow and still water were created beetwen them. Those changes had very positive impact on all fish specious in examin area.

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