The immunoecological study of common carp (Cyprinus carpio) from experimental pond
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| Year of publication | 2009 |
| Type | Conference abstract |
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| Description | The aims of the present study were 1) to analyze the potential associations between physiology, immunocompetence and parasitism in Cyprinus carpio and 2) to detect whether water temperature or parasitism is stronger factor affecting changes of fishs physiological and immunological system. During four different periods from 2007 to 2008 (i.e. early summer, late summer, autumn and winter) a total of 120 individuals of common carp from farmed Vodňany population were studied. The selected physiological (condition factor, gonado-somatic factor, concentration of 11-ketotestosterone) and immunological parameters (spleen-somatic index, count of leukocytes, phagocytes and lymphocytes, concentration of lysozyme, IgM antibodies, respiratory burst, activity of total pathway of complement) were measured and the fish were investigated for metazoan parasites. Metazoan parasites belonged into 14 parasite species. Among them Monogenea were the species richest and the most numerous group. The epidemiological characteristics were influenced by seasonal changes. The KW test revealed the seasonal differences for Crustacea and Cestoda with the highest abundance in summer, for Monogenea with the highest abundance in summer and autumn and for Digenea in autumn. Majority of physiological and immunological parameters were also influenced by seasonal effect. Using a Principal Component Analysis (PCA) we detected several correlations between immunity and physiology e.g. gonado-somatic index was positively correlated to the concentration of 11-ketotestosterone, IgM and activity of respiratory burst. Except the different associations between the immunity (measured by spleen-somatic index) and abundance of parasite groups i.e. a negative effect for Monogenea and a positive effect for Digenea, no correlation between immune parameter and parasite infections was revealed. These results may indicate some parasites evasive mechanisms for surviving in immunologically hostile environment and physiological and immune functions are under the influence of water temperature. Acknowledgments: This study was supported by Grant Agency of Czech Republic, project no. 524/07/0188 and Research Project of Masaryk University, project no. MSM 0021622416. |
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