Ecological Monitoring of Mediterranean SoleaAegyptiaca Transplanted Into Lake Qaroun, Egypt

Zaghloul, K. H., W. A. Omar, A. A. Abdel-Khalek, and S. Abo-Hegab, "Ecological Monitoring of Mediterranean SoleaAegyptiaca Transplanted Into Lake Qaroun, Egypt", Australian Journal of Basic and Applied Sciences, 2011.


Soleaaegyptiaca was successfully transplanted into Lake Qaroun from the Mediterraneansea to improve the yield of its original strain in the lake and this process continued at different timeintervals. Salinity of the lake increases during summer season due to high evaporation rates andchanges in the inflow regime. The deterioration of water resources in the lake during the summerseason is considered as a serious threat to the aquatic life. Therefore, this study was carried out duringsummer and beginning of autumn seasons where fish are exposed to severe alterations in the aquaticenvironment. Water quality indices of Lake Qaroun showed significant differences and the studiedwater heavy metals (Cu+2, Zn+2, Mn+2 and Pb+2) were in accordance with values of residual heavymetals in tissues, the bioaccumulation process showed also specificity to fish tissues. Histologicalsections in gills, liver and kidneys of S. aegyptiaca collected during June showed much moreimprovement than samples collected during other months. Histopathological alterations and cleardamages were obvious in samples collected during late summer and beginning of autumn (July,August and September) generally in accordance with the results of residual heavy metals in water andtissues. Moreover, the results revealed significant differences in values of growth indices, meat quality,blood parameters and plasma constituents of S. aegyptiaca collected from Lake Qaroun. Generally,the values were deteriorating during late summer and showed much more improvement during Juneand September.