During the parasitological examinations of the common carp(Cyprinus carpio,L.1758)from the Gradche Reservoir(Macedonia),a total of 126 fish samples were examined,from which parasite infestation was determined in 87 fish(69.05%).In this research,the following parasitic copepods were identified:Ergasilus sieboldi,Ergasilus briani,and Lernaea cyprinacea.Ergasilus sieboldi was found on gills of common carp,with a prevalence of 1.461%,while the mean intensity was 2.357.Ergasilus briani was found on fins of common carp,with a prevalence of 1.879%,while the mean intensity was 38.274.Lernaea cyprinacea was found on the fins of common carp,with a prevalence of 0.552%,while mean intensity was 2,000.Our findings of Ergasilus sieboldi,Ergasilus briani,and Lernaea cyprinacea in common carp are considered as first records for Macedonia.At the same time,common carp is a new host for Ergasilus briani in Macedonian waters.
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