Studies on some heavy metal pollutants in cultured oreochromis niloticus fish at Kafr El-Sheikh governorate

Abstract EN

Monitoring of some heavy metals in water and edible parts of Oreochro-mis Nilotic us were carried out for 7 months.

The water analysis revealed that the highest concentration of the copper, lead and zinc at El-Hamoul district, the average metal concentrations were 0.850, 0.680 and 0.243 ppm respecti-vely.

At El-Reyad district, the highest concentrations of copper, cadmium and zinc were, 0.850, 0.561 and 0.243 ppm respectively.

Whereas at Sidi-Salem district, the concentrations were highest in mercury 0.163 ppm.

Average levels of lead, mercury and cadmium showed higher levels of their conce-ntrations than the permissible limits, (0.005, 0.05, 0.001, 1 and 5 ppm for Cd, Pb, Hg, Cu and Zn respectively recommended by whom The residual analysis of heavy metal pollution in the fish flesh of Oreochromis Nilotic us, captured from these fish farms showed that the highest average of mercury and cadmium concentrations were 0.757 and 0.520 ppm at El-Hamoul district.

At El-Reyad district; the highest zinc and lead concen-trations in fish flesh were ; 0.779 and 0.694 ppm respectively.

While at Side-Salem district, the highest concentration was found in copper 0.466 ppm.

Application of slaked lime to fish ponds previously examined for heavy metal pollutants revealed remarkable reduction in their concentrations.