Prevalence of Two Monogenean Parasites on Different Length Groups of Crucian carp (Carassius carassius Linneus, 1758)

Abstract

Dactylogyrus anchoratus Dujardin, 1857 and Gyrodactylus katharineri Malmberg, 1964 were identified on crucian carp, Carassius carassius L., 1758 in the present study, which was carried out between February 1999 and January 2000. A total of 117 fish specimens were examined. The infestation prevalence and mean intensity levels for G. katharineri was 37.61%, respectivly 27.752.203 and for D. anchoratus was 24.78%, 4.691.730 per fish, respectively. The infestation prevalence and mean intensity levels were higher during spring and sumer, for the both parasites. No statistically significant preference for either sex of the fish was determined. In this study, we examined a total of 117 fish, out of which 44 (38%) were infested by 1221 G. katharineri, and 29 (25%) infested by a total of 136 D. anchoratus.