[Poisoning by copper sulfate of Lymnaea stagnalis infected with trematode parthenitae]

The effect of different concentrations of copper sulphate on the content level of carotinoid pigments in the haemolymph of Lymnaea stagnalis infected with parthenitae of trematodes was studied. The content level of carotinoid pigments in haemolymph of molluscs steadily decreases with an increasing concentration of the toxicant. The mortality of experimental animals under such conditions rises considerably, the mortality of infected animals being much higher than that of non-infected ones.