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Preliminary observations on infection of brackish and fresh water fish by heterophyid encysted metacercariae in Egypt

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Abstract

The infection status with heterophyids in the second intermediate host fish obtained from brackish and fresh water resources in Dakahlia governorate, northern Egypt was investigated. Encysted metacercariae (EMC) in the fish species Mugil cephalus, Mugil capito, Mugil auratus, Tilapia nilotica, and Tilapia zilli from brackish water and T. nilotica and T. zilli from fresh water were isolated by artificial digestion method and identified by microscopic examination. Morphometric analysis of EMC isolated from these fishes identified seven phenotypically distinct groups. No significant morphologic differences were detected between EMC of the same group obtained from different fish species. The adult flukes recovered from seven groups of puppies separately infected with distinct EMC groups were compatible with seven species belong to six genera of Heterophyidae namely Heterophyes heterophyes, Heterophyes aequalis, Pygidiopsis genata, Haplorchis yokogawi, Prohemostomum vivax, Phagicola ascolonga, and Stictodora tridactyla. EMC of these seven heterophyid species were detected in all examined brackish water fishes. On the other hand, only EMC of P. genata, H. yokogawi, and P. ascolonga were detected in fresh water fishes, T. nilotica and T. zilli. These results indicate that heterophyid infections occur in brackish and fresh water fishes in northern Egypt, where the parasites are indigenous.

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Authors and Affiliations

  1. Division of Veterinary Medicine, The School of Veterinary Medicine and Science, The University of Nottingham, College Road, Sutton Bonington Campus, Leicestershire, LE12 5RD, UK

    Hany M. Elsheikha

  2. Department of Parasitology, Faculty of Medicine, Mansoura University, Mansoura, 35516, Egypt

    Attef M. Elshazly

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  1. Hany M. Elsheikha
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  2. Attef M. Elshazly
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Correspondence to Hany M. Elsheikha.

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Elsheikha, H.M., Elshazly, A.M. Preliminary observations on infection of brackish and fresh water fish by heterophyid encysted metacercariae in Egypt. Parasitol Res 103, 971–977 (2008). https://doi.org/10.1007/s00436-008-1043-z

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  • DOI: https://doi.org/10.1007/s00436-008-1043-z

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