Synergistic effect between the parasitic infestation and bioaccumulation of heavy metals in freshwater fish [electronic resource].

Includes references.

In the present study, attempts were made to observe the synergistic effect between parasitic infestation and bioaccumulation of heavy metals in O. niloticus. Adult Acanthocephalans (Acanthosentis tilapiae) were isolated from the intestinal tract of O. niloticus (collected from EL- Manzala fish cultured ponds), with an incidence rate of 70% and intensity 15 worm / fish .The concentrations of heavy metals, namely, Lead and Cadmuim in both water samples collected from EL- Manzala fish cultured ponds and flesh samples of stressed O. niloticu5, were higher than those of the permissible limits reported by WHO(1984). Moreover, there were higher levels of heavy metals in samples of fish infested with Acanthocephalan, while, noninfested samples contained the lowest level.In the present study, attempts were made to observe the synergistic effect between parasitic infestation and bioaccumulation of heavy metals in O. niloticus. Adult Acanthocephalans (Acanthosentis tilapiae) were isolated from the intestinal tract of O. niloticus (collected from EL- Manzala fish cultured ponds), with an incidence rate of 70% and intensity 15 worm / fish .The concentrations of heavy metals, namely, Lead and Cadmuim in both water samples collected from EL- Manzala fish cultured ponds and flesh samples of stressed O. niloticu5, were higher than those of the permissible limits reported by WHO(1984). Moreover, there were higher levels of heavy metals in samples of fish infested with Acanthocephalan, while, noninfested samples contained the lowest level.

Summary in Arabic.

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