Perm State University
According to the results of research, performed by experts of Perm State University, the pollution of Mulyanka exercises strong negative influence on the condition of zoobenthos. Middle and lower parts of river are the most polluted ones. The biggest source of pollution is Lukoil Permneft Ltd, whose waste reaches Mulyanka by the Pyzh River. The oil products content of Mulyanka water at the place of the Pyzh's confluence exceeds the Maximum Permissible Concentration 49.4 times. Close to the mouth of Mulyanka ammonium content exceeds the MPC 1.3 times, 2.5 times for nitrites and 2 times for the oil products. As a result of bottom fauna sample analysis, 75 species have been discovered: ten species of Oligochaeta, two species of Hirudinea, six species of Gastropoda, two species of Bivalvia, and 55 species of Insecta. The distribution of macrozoobenthos in different sectors of the river is: