Survey on external parasitic abundance in Rutilus frisii fingerlings released to Sefidrood River in Guilan province

Document Type : Original Article

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Iranian Fisheries Science Research Institute

10.22075/jvlr.2025.33347.1095

Abstract

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This study aimed to determine the frequency of external parasites in Rutilus frisii kutum fish released to the Sefidrood in Guilan province in the year 2017. A total of 115 individual Rutilus kutum fingerling fish specimens were randomly caught by a net and sent alive to the parasitic laboratory of the fish health and disease department. After determining the length and weight of the fish, external parts including skin, fins, gills, and lens of the eye were sampled according to conventional principles in parasitological experiments. The parasites were identified with the help of a diagnostic key by a Nikon brand microscope and finally, calculations were made related to the prevalence and infection severity. At least 89 specimens (77.3%) of fish were infected with at least one of the parasites; Diplostomum spathaceum, posthodiplostomum, Ichthyophthirius multifliis, Trichodina sp., Dactilogyrus sp., Gyrodactylus sp. Nematode larvae and Copepodid stage of Lernaea. The highest prevalence value, intensity rate, mean frequency, and parasite range belonged to Dactylogyrus with 60%, 2.6 ± 3.7, and 1-17 respectively. The highest intensity rate (7 ± 3.3) was also seen in Trichodina and The lowest rate of prevalence was observed jointly in Ichthyophthyrius and Coupepod (0.87%). The parasitic fauna of fish in small water resources mainly includes parasites that have a direct life cycle (without an intermediate host) and do not enjoy much diversity.
 

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Journal of Veterinary Laboratory Research
Volume 17, Issue 1 - Serial Number 27
in processing
April 2025
Pages 13-27

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