Sampling: Sub-Surface water samples were collected
using acid washed, distilled water rinsed polyethylene
bottles. Samples were collected at monthly interval
during one year's period from April 2008 to March 2009.
Fish samples (Clarias garipinus, Oreochromis niloticus)
were collected from El-Moheet drain and agriculture
drains (Fig. 1). The collected samples were transported
alive in a large plastic water container supplied with
battery aerators as a source of air and washed with
distilled water.