rate of internal metazoan parasites in Rutilus Occurrence and intensity Dioctophyma renale of (Nematoda: frisii kutum and the first report Dioctophymidae) in Iran

paper is to examine the extent of occurrence and The aim of the present research the internal parasite of Rutilus frisii kutum caught in the degree of infections caused by of the Caspian sea during October 2007 till April 2008. In this study south western. part hundred specimens of Rutilus frisii kutum with an average weight of kg were two the carefally examined for parasitical investigation through cutting the body and specimens 148 ,abdominal part, digestive tract and other ventral organs. Upon inspectionof trematode of fish (74%) were detected to be infected by internal parasites specimens of the fish (i.e Aspidogaster limacoides order and nematode branch. Thus 119 in terms of intensity mean 59.5%) were infected by Asymphylodora kubanicum which midgut and hindgut parts of the guts ,was 12.93. The number of this parasite in foregutnumber of parasites identified in the marine were 48%, 35% and 17% respectively. The riverine fish. 100 specimens of the fish had also been fish were greater than those of limacoides with 50% occurrence and the mean intensity of infected by Aspidogaster the percentages of the parasites in the three parts of the guts infection was 20.44 and and 16% respectively. Their number in the marine fish exceeded the were 52% 32% same parasites in the riverine fish. Three of the examined fish (1.5%) number of the rate of infected by Eustrongylides excisus larvae with mean intensity of infection were larvae of 2.32% in body cavity, followed by fish sample (i.e 0.5%) affected by abdominal area. Raphidascaris acus showing mean infection intensity rate of in the metacercaria Diplostomum specimens of fish (2.5% occurance) were infested by the lens of the marine R. frisii spathaceum having mean occurence intensity of 2.2% in constituting 1.5%) showing damage by the kutum, followed by specimens of fish that had 1.66 mean intensity of infection in nematode of eDioctophyma renalspecies results of the study show that the fish were affected by heart pericard and kidneys. The due to their diverse range of food items. In the study, the various worm parasites were for the first time recorded in Iran. Meanwhile, it is for the first Dioctophyma renale .that Eustrongylides excisus was found in Rutilus frisii kutum time

کلیدواژه ها:

.frisii kutum ، Internal metazoan parasites Caspian sea ، Iran Rutilus