[The effect of trematode invasion and chromium sulphate on the crude protein content in the haemolymph of Viviparus viviparus (Mollusca: Gastropoda: Pectinibranchia)].

The combined effect of the trematode infection (Echinoparyphium sp.) and various concentrations of chromium sulphate (0.01, 1, 100 mg/l) onto the crude protein content in the haemolymph of the mollusc Viviparus viviparus was investigated. The normal contents of the crude protein is 0.7-1.22%. In adult specimens its concentration is 20-80% higher than in molluscs of junior age group. Sex difference by this index, which is higher in females, begins to manifest in four year old individuals only. The contents of crude protein in the haemolymph of pregnant females is 1.5 times higher than in latent ones. Under the low intensity of the trematode infection, the contents of crude protein in the haemolymph remains normal, while in the case of heavy infection, it decrease 100 times or lower. In the cases of 0.01-1 mg/l concentrations of chromium sulphate, the content of protein in the haemolymph of V. viviparus decreases, while in the case of 100 mg/l it increases abruptly, in comparison to the norm. The trematode infection intensifies these processes.