Infection with metacercaria of Clinostomum complanatum (Trematoda : Clinostomidae) in freshwater fishes from Southern Caspian Sea Basin

F. Aghlmandi, F. Habibi, M. A. Afraii, A. Abdoli, S. Shamsi

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Clinostomum complanatum is a digenetic food borne trematode that is known to heavily infect fish-eating birds in northern Iran, adversely affecting their health. We performed the present study to investigate the infection status of freshwater fish with digenetic trematode metacercariae (C. complanatum) in the water systems of Shiroud, Tajan and Gorganroud Rivers of the Southern Caspian Sea Basin, Iran. A total of 849 fish belonging to 9 species were examined, namely Alburnus alburnus, A. chalcoides, Alburnoides bipunctatus, Barbus plebejus, Capoeta gracilis, Carassius auratus, Squalius cephalus, Neogobius fluviatilis and Cobitis cf taenia. Of these, only fish in the Shiroud River were found to be infected with the parasite, with the species Alburnoides bipunctatus, Capoeta gracilis, Cobitis cf taenia and Squalius cephalus being affected. To the best of the authors' knowledge, this is the first time that Alburnoides bipunctatus and Cobitis cf taenia have been recorded as intermediate hosts of this parasite. Metacercariae were found mostly under the skin of the fish; however, one metacercariae was found in the brain of A. bipunctatus, with a curled tail suggesting that the parasite is able to migrate to the vital organs of fish and consequently affect their functions. To confirm the identity of the metacercariae, they were fed to two chickens to obtain adults which were identified as Clinostomum complanatum. The Shiroud River runs through highly populated areas and is the centre of major fishery activities, therefore the high prevalence of a zoonotic parasite such as C. complanatum in its fish is of high significance, particularly in light of the local diet, which occasionally includes smaller fish that are consumed whole and raw. It is suggested that fisheries and medical authorities in the region take the initiative to inform local farmers and the public about the potential risk that C. complanatum may pose to fish farms and public health.
Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalRevue de Medecine Veterinaire
Issue number7-9
Publication statusPublished - 01 Jan 2018

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