Abstract
The common carp blood picture was studied daily, for four days after the 3-hour exposure to 10 mg dm-3 of cadmium. The fish showed an increased number of immature erythrocytes in 24 and 48 hours, followed by erythrocyte damage in 96 hours after the treatment. Abnormal erythrocytes showed irregular nucleus shape and cell membrane protrusions. Neutropenia occurred immediately after the end of the exposure. Stress-related lymphocytosis was observed in 24 hours, followed by lymphopenia in 48 and 96 hours after the end of the exposure. It was small lymphocytes mainly that underwent changes, large ones being scarce over the entire experimental period. The number of decreased neutrophils in all experimental fish – both the control and the cadmium-exposed ones – indicates the effect of stress manipulation. The cadmium exposure also caused a decrease in thrombocyte count (however statistically not always significant due to high individual variability), and a shift towards round cells in the thrombocyte pattern.
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