The objective of this diploma thesis was to evaluate the quality of the water after flow through the ponds with conventional (Blatensko, Czech Republic) and organic (Waldviertel, Austria) technologies using the colonization of artificial substrates by macrozoobenthos (MZB) to asses the differences in the influence of different managements of pond farming (organic vs. traditional) on water quality. Samplings were performed in monthly intervals (AprilSeptember 2016) at nine inflow and outflow profiles of four ponds. Samples of MZB were processed in the laboratory. Evaluation of MZB was supplemented by in-situ monitoring of basic parameters of the aquatic environment. The resulting values of saprobic index (SI) match the water quality in outlets in the range valid for the beta to alpha mesosabrobity (SI 2.302.62). In the inlets to the Skaličný and Haslauerteich ponds, where the SI value corresponded the betamesosabrobity (SI 2.482.49), the discharged water quality in the outlet was insignificantly (p>0,05) deteriorated to the alphamesosabrobity (SI 2.54 2.62). On the contrary, in the inlet to the Gebhartsteich pond, where the value SI matched the alphamesosabrobity (SI 2.57), water quality in the outlet was insignificantly (p>0,05) slightly improved (SI 2.54), but the degree of saprobity has not changed. Similarly, in the inlet to the Pančár pond, where the SI value matched betamesosabrobity (SI 2.30), the outlet water quality was insignificantly (p>0,05) slightly deteriorated (SI 2.33), however again the degree of saprobity remained unchanged. Water quality changes after the flow through the investigated ponds resulted in the increase of the diversity index (H´) and vice versa (the worse water quality the lower H´). According to the analysis of the data of environmental conditions in organic and conventional carp ponds, they did not differ significantly. Also the species richness and the total number of individuals were not significantly different. The results of this diploma thesis demonstrated that the applied organic technologies of fish culture in monitored ponds did not have any significant impact (improvement) on the quality of aquatic environment and the composition of macrozoobenthos in the recipients of farm outflows, and also that no significant differences (deterioration) can be documented in the outflows from conventional ponds compared to the organic pond farming management.

The presented thesis deals with the structure and composition of macrozoobenthos of Pohořský and Dobechovský brooks in the Novohradské Mountains. The evaluation was based on the collections from 10 localities carried out in July 2001, March 2002 and July 2002/2003. In addition to determination and classification of the species found, the collections have also been qualitatively evaluated with the use of the diversity index (saprobic index, Belgian Biotic index) and the similarity index. It has been found that the zoobenthos population of Pohořský and Dobechovský brooks encompasses the species of both trout and grayling zones. In most taxa it concerns characteristic representatives of clear, flowing and adequately aerated water. Mutual species similarity of macrozoobenthos population of Pohořský and Dobechovský brooks is approximately 40%. The comparison of macrozoobenthos population diversity indices of Pohořský and Dobechovský brooks has shown that the Pohořský brook bentic fauna is, according to the obtained data, richer and better balanced. From the saprobity point of view, the Pohořský brook can mainly be placed into oligosaprobic stream class. The water of Dobechovský brook oscillates between oligosaprobic and {$\beta$}-mesosaprobic level.