EN
Studies were performed on 60 carps werghing from 30 to 40 g. Levamisole was used at the concentration of 10 mg per 1 l of water for 1 hour, and the drug TFX at 5 mg per 1 l of water for 96 hours. Blood was collected after 1, 2, 4, 5, 7, 8, 12 and 16 weeks after the treatment. The following were assessed: the number of leukocytes and neutrocytes, the metabolic activity of granulocytes (NBT) and the level of lysozyme in the blood by the spectophotometric method. It was found that both levamisole and the drug TFX possessed immunostimulating effects in carps. Their effects lasted for 5 weeks following levamisole administration and to the end of the experiment in case of the TFX drug. The authors suggest that the TFX drug is more effective than levamisole and persists for a longer time in carps treated in such a manner.