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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.

acta parasitologica

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