the study of monogen parasites of freshwater some fish in farm ponds in isfahan province

the studies of parasitology was performed on freshwater in farm ponds in isfahan province during the years of 2006- 2008 and in total were fished 150 fish from farm ponds of freshwater fish and dual purpose of agriculture of three regions in isfahan. the fish were 65 cyprinus carpio, 40 hypophthalmichthys molitrix and 45 ctenopharyngodon idella. the samples were taken to laboratory alive and after injury spinal cord and following investigation of microscopic parasites that were made the parasites blood of isfahan, were identified. dactylogyrus extensus, d.sahvuensis, gyrodactylus spp. and lernaea.according to the result of this study, cyprinus carpio and hypophthalmichthys molitrix were infected by parasitic worm consist of dactylogyrus spp., gyrodactylus spp and lernaea and ctenopharyngodon idella was infected by parasites gyrodactylus spp. and lernaea.