EN
The studies were carried out on 2-month-old breeding carp. The CERBIO probiotic was given with corn feed at a dose of 150 or 300 g/100 kg of fodder for 53 consecutive days. The usefulness of that feeding system was assessed on the basis of body weight increase of the fish and also by taking into account immunological indices (phagocytosis, metabolic activity of neutrophiles, activity of myeloperoxidase) and haematological ones (number of leucocytes and neutrophiles, blood picture). The administration of the probiotic proved to be profitable as the body weights of the fish under study were higher compared with control group, especially when the probiotic was given at a dose of 300 g/100 kg of fodder. Immunological - and to some extent haematological results showed that the parameters examined were higher in the experimental group than those in a control one.