[Changes in the parasitic fish fauna of the Kaĭrak-Kum reservoir over a long period].

During last few years a tendency for the reduction in the number of parasites of all investigated fishes has been observed. This is connected with the general tendency for the impoverishment of the reservoir flora and fauna, that may be the result of the fluctuations of its water level. Finally this process leads to the reduction in the number of many species of parasites and even to their disappearance.