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.
Highlights
The importance of fish parasites is directly related to the importance of the fish that they affect (Hoffman, 1967)
Out of the 117 fish specimens examined, 44 were infested with G. katharineri, resulting a prevalence of 37.61% and mean intensity levels 27.75±2.203., while 29 fishes were infested with D. anchoratus, and its prevalence was 24.78% and mean intensity levels 4.69±1.730 per infested fish (Tab. 1)
The highest infections with G. katharineri and D. anchoratus were recorded on 146-184 mm lenghts fishes (50%, 34.62%)
Summary
The importance of fish parasites is directly related to the importance of the fish that they affect (Hoffman, 1967). Especially trematodes, can cause gill infestations and inhibite oxygen exchange across gill lamella (Mitchum, 1995). Considering these aspects, fish parasites under favorable conditions, cause economic loss by affecting the health of fishes and causing high mortality (Tripathi, 1959). Monogenean parasites are still widespread in freshwater wildlife, on farm fishes and marine habitats. The genus Gyrodactylus is represented by a great variety of fish parasites, inhabiting both freshwater and sea water environments (Bykhovskaya-Pavlovskaya et al, 1962; Harris, 1985). Monogenetic trematodes of freshwater fishes have been studied by Gussev (1967) and Kulkarni (1969). The majority of Dactylogyrids have strictly hosts, as they appear as specific parasites ( Jalali, 1992)
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