The effect of water pollution on chromosomal behavior in nile tilapia (Oreochromis Niloticus) [electronic resource].

Includes reference.

Random samples from three different natural populations were caught from three different localities i.e., polluted Drainage canal, Faculty Fish Farm and The Edku Lake. Different heavy metals concentrations in water and in different fish organs (Le., liver, head, and muscle) were estimated to identify the residues of such pollutants in fish body in relation to water quality resources. Water analysis indicated that Drainage Canal of village NO.10 performed the significant higher level of heavy metals concentrations in relation to other two water resources, while the lowest concentration of different heavy metals were found in The Edku Lake. It's mean that water quality might be ranked as Edku Lake (the best), Faculty Fish Farm (the intermediate) and Drainage Canal (the most drawback resource). Such differences among these three water resources in their heavy metals concentrations affect drastically the concentrations of such heavy metals in fish organs from the three different localities. Due to accumulation of the heavy metals in fish tissue; data clearly indicated that Drainage Canal water fish samples exposed high degree of heavy metals concentrations in fish organs in relation to other two localities. For instance lead concentration in Drainage Canal water exceeded the other two localities with 77.4 fold for Fish Farm and with 152.7 fold for Edku Lake. The degree of water pollution with different heavy metals drastically affected the chromosomal behavior during mitosis. Different types of chromosomal aberration were observed i.e., gaps, deletion, fragment, stickiness... etc. in the studied tissues i.e., gills and blood red cells.

Summary in Arabic.

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