the study of the plerocercoid of diphyllobothriidae (cestoda, pseudophyllidea) in two cyprinid hosts, abramis brama and alburnoides bipunctatus from north and northwest of iran

background: the plerocercoid stage of pseudophyllideancestoda infected a wide range of fresh water fish,particularly the members of the cyprinidae family. the parasitespecies are the most common pathogens that have severe effectson fish. objectives: the aim of the present study is todetermine the occurrence and distribution of the plerocercoid ofdiphyllobothriidae in two freshwater fish from north andnorthwest of iran. finally, we discuss the role and dynamics ofthese species of fish in the transmission of infection. methods:this study was carried out from september 2011 to september2012on a total of 883 a. bipunctatus and 418 a. brama from northand northwest of iran. the samples were analyzed to find theplerocercoid infection. results: from a total number of 883 a.bipunctatus and 418 a. brama fish samples, 558 fish (63.19%)of the former and 67 fish (16.02%) of the latter were infected. therate of infection was significantly lower in winter (p