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Licensed Unlicensed Requires Authentication Published by De Gruyter April 18, 2017

Morphological re-description of Electrotaenia malapteruri (Cestoda: Proteocephalidae) and Dujardinnascarismalapteruri (Nematoda: Heterocheilidae) infecting the Electric catfish Malapterurus electricus and heavy metal accumulation in host and parasites in relation to water and sediment analysis in Lake Manzala, North Delta, Egypt

Rewaida Abdel-Gaber, Fathy Abdel-Ghaffar, Mohamed Abdallah Shazly, Kareem Morsy, Saleh Al Quraishy, Sanna Mohamed and Heinz Mehlhorn
From the journal Acta Parasitologica


Parasites are one of the most serious limiting factors in aquaculture. The Electric catfish Malapterurus electricus was subjected to study the prevalence and mean intensity of parasitic infections throughout the whole year of 2015. Heavy metals accumulation in host fish and parasites were determined in relation to water quality and sediments of two different sites of Lake Manzala (Manzala and Bahr El-Baqar), Egypt. A total of 100 specimens of Electric catfish were collected and examined for the presence of helminth parasites. Two parasite species were recovered and morphologically identified. These were cestoda Electrotaenia malapteruri and nematode Dujardinnascaris malapteruri. Heavy metal analysis in water and sediments showed that measured heavy metals in Bahr El-Baqar were found in risky levels higher than permissible limits and Manzala site. Sediments were found to contain a higher level of metals than water samples. Heavy metals accumulation in recovered parasites and their host were also determined and showed significantly higher concentrations in parasites compared to their host tissues. According to bioconcentration factors, E. malapteruri showed that highest accumulation rate for all recorded elements up to 302. Essential elements like Cu and Fe were found in significantly higher concentrations in D. malapteruri, whereas E. malapteruri accumulated elements Cd, Pb, Ni, Mn, Zn and Ca to a significantly higher degree. Accordingly, the ratios (C[D.malapteruri]/C[E. malapteruri]) for most essential elements were higher than 0.5. Therefore, fish cestodes can be regarded as useful bio-indicators more than nematodes when evaluating the environmental pollution of aquatic ecosystems by heavy metals.

  1. Conflict of Interest. The authors have indicated that they have no conflict of interest regarding the content of this article.


The authors are thankful to the Faculty of Science, Cairo University, Cairo, Egypt, for providing all the facilities to complete this work. In addition, the authors extend their appreciations to the Deanship of Scientific Research at King Saud University for funding the work through the international research group project PRG-1436-02.


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Received: 2016-9-14
Revised: 2017-1-17
Accepted: 2017-1-19
Published Online: 2017-4-18
Published in Print: 2017-6-1

© 2017 W. Stefański Institute of Parasitology, PAS