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Volume 62, Issue 2 (Jun 2017)


Morphological re-description of Electrotaenia malapteruri (Cestoda: Proteocephalidae) and Dujardinnascaris malapteruri (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
  • Corresponding author
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
  • Email:
/ Fathy Abdel-Ghaffar
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
/ Mohamed Abdallah Shazly
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
/ Kareem Morsy
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
/ Saleh Al Quraishy
  • Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
/ Sanna Mohamed
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
/ Heinz Mehlhorn
  • Parasitology Institute, Düsseldorf University, Düsseldorf, Germany
Published Online: 2017-04-18 | DOI: https://doi.org/10.1515/ap-2017-0040


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.

Keywords: Electrotaenia spp.; Dujardinnascaris spp.; Malapterurus electricus; morphological studies; heavy metals accumulation; biological indicators


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About the article

Received: 2016-09-14

Revised: 2017-01-17

Accepted: 2017-01-19

Published Online: 2017-04-18

Published in Print: 2017-06-01

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

Citation Information: Acta Parasitologica, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2017-0040. Export Citation

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