Resistance in carps (Cyprinus carpio L.) affected by a natural bacterial infection

https://doi.org/10.17221/7844-VETMEDCitation:Stosik M., Deptula W., Trávniček M. (2001): Resistance in carps (Cyprinus carpio L.) affected by a natural bacterial infection. Veterinarni Medicina, 46: 6-11.
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Sick carps, affected by acute or chronic forms of erythrodermatitis (CE) were studied. The studies were aimed at obtaining pathophysiological data which would permit evaluation of clinical status and prognosis in carps of various age (23 or 28 months). This was approached by estimation of the number of carps and of dynamics of changes in nonspecific humoral and cell mediated resistance and in levels of selected serum proteins. The ingesting index of neutrophilic granulocytes and percent of neutrophilic granulocytes capable of ingesting proved significantly higher in sick carps as compared to the healthy carps, at every age of carps and form of the disease. Metabolic activity of neutrophilic granulocytes, expressed in the percentage of NBT+ cells was the same in carps with the acute CE form and in the control fish. On the other hand, in carps suffering from the chronic form of the disease a significant decrease in the number of cells was disclosed. NBT index and the amount of formazan in fishes with acute CE form demonstrated a decrease as compared to the corresponding values in control carps. Carps with the chronic CE form showed increases in the indices. The level of lysozyme (LZM) was higher in 23 or 28 months old carps with the acute CE form than in healthy fishes. In carps affected by the chronic CE form no significant differences in LZM levels were disclosed as compared to the healthy carps. MPO activity in the sick carps, particularly those with the acute form of CE, was significantly higher than in the control carps. On the other hand, serum globulin and total protein levels in the sick carps were lower than those in the control carps. The two indices showed a particularly extensive decrease in carps affected by acute form of the disease. When all the parameters estimated in fishes with acute CE forms were taken into account, no differences associated with age (23 or 28 months) were observed that could be related to tendencies and directions of the observed changes.
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