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Abstract
This paper presents the results of a study on Crustacean, Tapeworm and Nematode parasites in Crucian carp (Carassius auratus auratus) samples collected in Phu Yen province. A total of 201 specimens, including 64 from Bau Sung swamp (Tuy An district), 55 from Ky Lo River (Tuy An district) and 82 from freshwater fish ponds (Dong Hoa district) were collected for this study. Results showed that crucian carp in Phu Yen was infected with two crustacean species (Lernacea cyprinacea and Corallana grandiventra), one tapeworm species (Bothriocephalus sp.), two nematode species (Anisakis sp. and Cucullanus cyprini). Analysing on the whole samples, L. cyprinacea Linnaeus, 1758 accounted for the highest prevalence (7.5%), but lowest average intensity (1.4 specimens/fish specimen), while Bothriocephalus sp., accounted for the lowest prevalence (2.0%), but highest average intensity (9.0 specimens/fish specimen); C. grandiventra accounted for a prevalence of 7,0% with an average intensity of 1.6 specimens/fish specimen, both nematodes accounted for prevalences of 4.0% and average intensities of 2.9 specimens/fish specimen. Analysing for sampling sites, results showed that, fish collected from Ky Lo river infected with all five parasitic species; while fish collected in Bau Sung swamp infected with 3 parasitic species, including L. cyprinacea, Anisakis sp. and C. cyprini; the fish collected from freshwater ponds infected with two parasitic species, including L. cyprinacea and Bothriocephalus sp. Analysing for dry and rainy seasons, results showed that, fish sampled in the dry season infected with five parasitic species, while fish collected in rainy season was not infected with cestode.
Key words: Crucian carp, crustaceans, nematode, Phu Yen Province, tapeworm.