Rivers flowing through valleys constitute one of the most diversified ecological systems with one of the highest indexes of biological production, species variety, and abundance of living organisms. Simultaneously, they are frequently subjected to strong anthropogenic activity [1, 2]. Each and every form of interference of a watercourse's stream bed has an effect on its biocoenosis [3, 4]. Regulatory works such as channel resectioning, bank reprofiling, channel deepening, channel widening, and the protection of river banks-as well as sometimes unnecessary or overambitious