Parasite fauna of ide, Leuciscus idus (L.) in Lake Dąbie, Poland

Background. The previous survey on parasites of ide in Poland was carried out in 1987 and there has been no data available on the parasites of this fish from areas in Poland west of the Vistula River. The aim of the present study was to survey the parasite fauna of ide, Leuciscus idus in Lake Dàbie and to compare the results with the relevant data on the subject published by other authors. Material and methods. Standard parasitological procedures were applied to 110 individuals of ide, Leuciscus idus (L.) caught within 2000–2003 in Lake Dàbie, Szczecin, Poland. Results. All fish examined were infected with parasites. The parasites recovered, represented 32 species and 11 higher taxa (Oligohymenophorea, Myxosporea, Monogenea, Digenea, Nematoda, Palaeacanthocephala, Euacanthocephala, Hirudinea, Copepoda, Branchiura, and Bivalvia). A total of 15 parasite species represented new host records for ide in Poland (Dermocystidium sp., Myxidium pfeifferi, Zschokella nova, Myxobolus carassii, M. muelleri, Henneguya cutanea, Tripartiella copisa, Paradiplozoon bliccae, Gyrodactylus prostae, Anisakis simplex, Streptocara crassicauda, Philometra rischta, Argulus foliaceus, Piscicola geometra, Hemiclepsis marginata). The highest values of prevalence were recorded for: Ergasilus sieboldi, Diplostomum spp., Tylodephys clavata, and Paracoenogonimus ovatus. Conclusion. Infection parameters of the presently surveyed ide were distinctly different from those previously described. It is possible that populations of some parasites grew within the past 20 years.