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[Host and topic specificity of Monogenea--parasites of Polish fish and amphibians].

This paper presents the distribution of Monogenea among Polish fish and amphibians as well as their location on the host body. Out of 127 Monogenea species recorded in Poland, 126 were found in fish, and only one in amphibians. Dactylogyridae were found in 3, Diplozoidae in 2, whereas Ancyrocephalidae in 6, and Gyrodactylidae in 9 fish families. Most Monogenea are closely attached to their location (topospecificity). Some species of fish parasites are found on gills, where they may occupy various microhabitats, while others (especially Gyrodactylidae) were found on fins, skin, gills, and rarely in the oral or nasal cavity.