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Asian Journal of Animal and Veterinary Advances
  Year: 2018 | Volume: 13 | Issue: 4 | Page No.: 352-359
DOI: 10.3923/ajava.2018.352.359
 
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Oreochromis niloticus and Clarias gariepinus Fish Infected with Digenean Metacercariae: Experimental Infection of Puppies and Some Chemical Alterations in Fish

Ghada A.K. Kirrella, Nagwa M. Elhawary, Eman K. Bazh, Shimaa S. Gh. Sorour and Khaled Mohamed El-Dakhly

Abstract:
Background and Objective: Fish serve as appropriate hosts for several parasitic helminths, particularly digeneans. In this study, presence of encysted metacercariae (EMC) of such helminths and their effects on the quality of freshwater fish was examined. Trematodes recovered from puppies experimentally infected with EMC (in Oreochromis niloticus (O. niloticus) and Clarias gariepinus (C. gariepinus) fish) were identified and chemical alterations in fish were evaluated. Materials and Methods: A total of 200 fish (100 O. niloticus and 100 C. gariepinus) were collected from markets in Kafrelsheikh, Egypt. Collected fresh specimens underwent parasitological examination searching for metacercariae as well as biochemical tests were done. Experimental infection, using the recovered metacercariae, for puppies was applied to identify adult flukes. Chemical parameters reflecting fish freshness were used. Among those, moisture, protein contents, oil contents, ash, pH, total volatile nitrogen, thiobarbituric acid, peroxide value and free fatty acids were evaluated. Results: The prevalence of digenean EMC infection in both O. niloticus and C. gariepinus was 24.0 and 30.0%, respectively, predominantly in dorsal regions. Head, tail and anal regions had variable degrees of infection. Heterophyids [Heterophyes heterophyes (H. heterophyes) and Heterophyes aequalis (H. aequalis)] and haplorchids [Haplorchis pumilio (H. pumilio)] were recovered from O. niloticus, while cyathocotylids [Prohemistomum vivax (P. vivax) and Mesostephanus spp.] were found in both species. The chemical composition of fish was significantly (p<0.01) affected. Heavy infection induced a significant decrease in protein, oil and ash contents with a significant (p<0.01) increase in the total volatile nitrogen, thiobarbituric acid number, peroxide value and free fatty acids. Moreover, a non-significant difference in moisture contents and the pH degree of muscles was found. Conclusion: The recovery of adult digeneans from experimentally infected puppies reflected that eaten fish harboured encysted metacercariae. Chemical composition of infected fish had some alterations. Accordingly, parasitologists, ichthyologists, veterinarians and authorities must greatly consider the digeneans-fish relationship via the proper control of eating raw/inadequately cooked fish which assume reduced nutritional values.
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How to cite this article:

Ghada A.K. Kirrella, Nagwa M. Elhawary, Eman K. Bazh, Shimaa S. Gh. Sorour and Khaled Mohamed El-Dakhly, 2018. Oreochromis niloticus and Clarias gariepinus Fish Infected with Digenean Metacercariae: Experimental Infection of Puppies and Some Chemical Alterations in Fish. Asian Journal of Animal and Veterinary Advances, 13: 352-359.

DOI: 10.3923/ajava.2018.352.359

URL: https://scialert.net/abstract/?doi=ajava.2018.352.359

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