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Palíková M., S. Navrátil: Occurrence of Anguillicola crassus in the Water Reservoir Koryãany (Czech Republic) and its Influence on the Health Condition and Haematological Indices of Eels. Acta Vet. Brno 2001, 70: 443-449. The occurrence of the nematode Anguillicola crassus in eels in the Water Reservoir Koryãany was studied from 1994 to 2000. In 1998 and 1999 the study was performed at more frequent intervals in order to evaluate possible seasonal changes of the disease and the influence of the parasite on the health condition of eels in this water reservoir. In all, 143 eels were sampled. Haematological examinations were performed using 46 specimens in 1999. Prevalence of nematodes showed seasonal dynamics and varied from 43 to 100%. Intensity of infection by young and adult nematodes in the swim bladder of eels varied from 1 to 66 specimens, with the mean being 6.6 nematodes per individual. Prevalence of larval stages in the swim bladder amounted from 38.5 to 100%. There were patho-anatomical changes in the swim bladder as well as in the ductus pneumaticus found. Severe damage to the swim bladder was observed especially during autumn months. No significant differences were found between infected and non-infected eels, or in dependence on the numbers of nematodes in the swim bladder with regards to the haematological parameters examined (i.e., hematocrit, red and white blood cell counts). The obtained values are also mentioned in relation to the date of sampling. There was a rise (p < 0.05 and p < 0.01) in the hematocrit value sampled on October 10, 1999 (0.29 L.L-1) in comparison to sampling on June 7, 1999 (0.25 L.L-1), September 16, 1999 (0.25 L.L-1) and June 30, 1999 (0.27 L.L-1), respectively. Red blood cells were significantly (p < 0.05 and p < 0.01) lowest on September 16, 1999 (1.04 T.L-1) as compared to sampling on June 7, 1999 (1.28 T.L-1), October 6, 1999 (1.24 T.L-1) and June 30, 1999 (1.41 T.L-1), respectively. White blood cell counts were lower (p < 0.05 and p < 0.01) on October 6, 1999 (27.6 G.L-1) as compared to values obtained on June 7, 1999 (56.2 G.L-1), and September 16, 1999 (41.2 G.L-1) and June 30, 1999 (39.0 G.L-1), respectively. Differential counts of white blood cells showed no significant changes. Infected as well as non-infected eels were characterised by lymphocytic type of blood (88.02 and 90.34 % of lymphocytes, 10.27 and 7.38 % of granulocytes, 0.52 and 0.94 % of monocytes, 1.17 and 1.34 % of blasts, respectively). Anguillicolosis under conditions of the Koryãany Water Reservoir did not cause mortality and clinical signs of the disease in the population of eels. Prevalence, intensity of infection, hematocrit, erythrocytes, leukocytes, differential leukocyte count

acta veterinaria brno

Occurrence of Anguillicola crassus in the Water Reservoir Koryčany (Czech Republic) and its Influence on the Health Condition and Haematological Indices of Eels