[Experimental study of the factors influencing the multiplication and numbers of bream dactylogyrids]

Experiments conducted have shown that water temperature can affect dactylogyrids in two ways. From one hand, the direct influence stimulates the development and reproduction of the parasites that results in the increase of their abundance. From the other hand, the indirect effect can take place. The rise in the temperature increases the general resistence of the fish organism and favours the formation of immunological reaction to hyperinfection that causes the further fall in the parasite abundance. Thus, the seasonal dynamics of the abundance of dactylogyrids depends on the complex interaction of these two factors.