Seasonal variation in haematological parameters in infected and uninfected rudd (Scardinius erythrophthalmus) with Cryptobia tincae

Abstract

An investigation was carried out to assess and compare the seasonal changes in haernatological parameters of rudd (Scardinius erythrophthalmus) parasitised and unparasitised with Cryptobia tincae. Prevalence was 56.19% in winter, 35.71% in spring, 23.53% in summer and 23.63% in autumn. No statistically significant differences were observed in erythrocyte, leucocyte and haernotocrit values between infected and uninfected rudd for any season (p > 0.05). Significant differences in seasonality were only found for erythrocyte counts (p < 0.05) in the parasitised and unparasitised rudd. In the leucocyte profiles, significant differences were seen only for lymphocytes in autumn between parasitised and unparasitised fish. While the seasonal differences (p < 0.05) were determined for neutrophils and eosinophils in the parasitised rudd, the differences were estimated only for eosinophils in the unparasitised rudd.