عنوان مقاله [English]
Kutum (Rutilus frisii kutum) is a precious and endemic subspecies which is found in the Caspian Sea. Shazde river has unique ecological and biological specifications. Every year hundreds of Caspian Sea Brood stock kutum (Rutilus Frisii kutum, Kamonsky 1901) emigrate to this river for reproduction, so that it has a considerable role in recovery of kutum stocks. For this reason 100 kutum were surveyed during the reproduction migration season 1387 (from April 2007 till May 2007). After fishing and taking to the laboratory different fish organs such as skin, gill and digestive organs were studied. According to the results four species of parasites by the names of Asymphylodora kubanicum, Aspidogaster limacoides (Digenera), Dactylogyrus sp, Paradiplozoon chazarikum (Monogenea) were recognized. Among these 4 parasites, Dactylogyrus sp had the highest prevalence (100%), mean intensity (48.59) and parasite number range (18-134).While the lowest prevalence was related to A.limacoides (66.64%) and the lowest mean intensity were referred to A.limacoides (1.37), the lowest number range was related to A.limacoides (1-5), also according to this research parasitical pollution of kutum had age and sexual differences.