No 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 27.75±2.203 and for D. anchoratus was 24.78%, 4.69±1.730 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.

Dactylogyrus species are a group of monogenean gill parasites that are highly specific to freshwater fishes; represents the most dominant genus among the Monogenea with regard to host distribution and location. They were sampled 14 species from more than 27 host collected in Turkey. Among these dactylogyrid parasites, Dactylogyrus fraternus could be described and illustrated from specimens collected from gills of a cyprinid fish, bleak Alburnus alburnus, in Enne Dam reservoir from Kutahya, Turkey. Diagnostic characters of this species are the tegument of trunk showing annulations, except on the cephalic region, and copulatory complex comprising sclerotized, basal part broad, the tube which is long and hard. The purpose of the present study was to determine, on the whole, the body structure of the Dactylogyrus fraternus in bleak.