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Mn > Cu > Ni > Zn > Cr > Pb > Co > Cd, while the average concentrations of the heavy metals analyzed in the labile fraction followed the order: Fe > Mn > Cu > Ni > Pb > Zn > Co > Cr > Cd. The concentrations of all studied heavy metals ranged between the Effect Range-Low (ERL) and the Effect Range-Median (ERM) for most studied locations. Metal pollution index (MPI) shows very high values for both total and labile fractions at all the examined locations. Field observation reveals that Lake Burullus received industrial, agricultural and domestic sewage, suggesting that anthropogenic input is the main source of heavy metal contamination. Health hazard calculations for the contaminated sediments exhibited a possibility,pf health risk due to long-term exposure of the human to the polluted sediments of Lake Burullus.]]>
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15%) and fin erosion (>30%) of the total body area among male and female T. zillii from the contaminated site were elevated compared to other ratios. The seasonal variation of different skin diseases revealed that the maximum prevalence, ranging between 40.8% and 24.2%, were detected in summer and spring respectively. The GLM statistical analysis revealed that site and season had significant effects (p15%) versus such biological variables showed that feeding intensity (FI), fish condition (k) and hepato-somatic index (HIS) of males decreased with increasing the area of skin ulcers, while TSI was not affected by this lesion. The trend was more obvious in case of females, where FI5 K, HIS and OS1 were negatively affected by the skin ulcers. On the other hand, FI and K of males and FI, K and OSI of females were inversely correlated with severe fin erosions (>30%). Laboratory investigations showed that the skin ulcers and fin erosions first appeared in the 5th day after the application of the contaminated food with or without water from site (B) in the aquaria. The mortality rate in fish, which were provided with the contaminated food with or without water from site (B), was 10 % at day'18th and 33.3 % at days 19th and 20th, reaching 100 % at 22nd day.]]>
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