EN
Three groups of carps were kept for 6 to 12 weeks at 11°C, 16°C and 23°C. A portion of the fish from each group was infected with Aeromonas hydrophila. Experimental fish were subjected to evaluation of number of thrombocytes, the index of bacteria-thrombocyte adherence (IB-TA), the percentage of active thrombocytes (%AT) and the index of thrombocyte aggregation (ITA). Carps kept at 11℃ revealed the highest values of the indices examined whereas carps kept at 23℃ the lowest ones. The indices were examined singly bcfore the bacteria administration. Fish demonstrating the lowest values of the indices were most sensitive to the infection and revealed the highest mortality rate. In contrast, fish with the highest values of the indices revealed the highest immunity. These relationships were obvious mainly at 11°C whereas at 23°C, by contrast, they were less distinct.