In this study, during October 2007 till April 2008 two hundred specimens of Rutilus frisii kutum with an average weight of 1±0.2 kg were parasitologically examined through cutting the body and the abdominal part, digestive tract and other ventral organs. Upon inspection, 148 specimens of fish (74%) were detected to be infected with internal trematodes of Aspidogaster limacoides and nematodes. Thus 119 specimens of the fish (i.e 59.5%) were infected with Asymphylodora kubanicum which in terms of intensity mean was 12.93. The number of parasites identified in the marine fish were greater than those of river fish. 100 specimens of the fish had also been infected with Aspidogaster limacoides with 50% occurrence and the mean intensity of infection was 20.44. Their number in the marine fish exceeded the number of the same parasites in the river fish. Three of the examined fish (1.5%) were infected with Eustrongylides excisus larvae with a mean intensity of infection rate of 2.32% in body cavity, followed by 2 fish sample (i.e 0.5%) affected by larvae of Raphidascaris acus showing a mean infection intensity rate of 1% in the abdominal area. 5 specimens of fish (2.5% occurance) were infected with metacercaria Diplostomum spathaceum having a mean occurence intensity of 2.2% in the lens of the marine R. frisii kutum, followed by 3 specimens of fish (constituting 1.5%) showing damage by the nematode of Dioctophyma renale species that had 1.66 mean intensity of infection in heart pericard and kidneys. The results of the study showed that fish were affected by various worm parasites due to their diverse range of food items. In the study, the Dioctophyma renale was recorded for the first time in Iran. Meanwhile, it is for the first time that Eustrongylides excisus was found in Rutilus frisii kutum
کلید واژگان :Rutilus frisii kutum Internal metazoan parasites Caspian Sea Iran
ارزش ریالی : 300000 ریال
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