الفهرس 
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Abstract
Heavy metal concentrations in the environment are of great concern due to their serious effects through the food chain on animal and human health.
The present study was carried out in order to estimation of some heavy metals (Cd, Cu, Fe, Mn, Ni, Pb and Zn) in the food chain of lake Quaron where (52) sample of surface water and sediment ,(50) samples of fish and shrimp ( whole Atherina sp. , muscles of Mugil cephalus , Solea Vulgaris , Tilapia zillii and Penaeus sp. ) and (73) samples from liver ,muscles and feathers of birds (Anas crecca, Ceryle rudis, Egretta garzetta, Fulica atra and chicks and adults of Larus genii ) were collected from the study area.
In this study, the annual concentrations of the estimated heavy metals (µg/l) in water samples which were collected from the study area were ranged as follow; Cd (0.051 – 0.144), Cu (0.711– 1.275), Fe (5.361– 11.17), Mn (0.201– 2.205), Ni (0.255– 6.39), Pb (0.333– 1.131) and Zn (1.203 – 44.736) and in the following order; Zn > Fe>Ni >Mn>Cu > Pb > Cd and within the permissible limits .
In the present study, the annual concentrations estimated metals (µg/g) in surface sediment samples which were collected from the study area were ranged as follow; Cd (0.055-0.94), Cu (2.13– 230.27), Fe (229.57-320.89), Mn (56.495-192.18), Ni (1.59– 18.49), Pb (1.865– 13.5) and Zn (6.66– 36.75) and in the following order; Fe > Mn > Zn > Pb >Cu > Ni > Cd where they were within the permissible limits of Sediment quality guidelines (SQG) except for Cu it was higher .
The estimated average (µg/g dry weight) of Cd, Cu, Fe, Mn, Ni, Pb, and Zn levels different fish species and shrimp were; Atherina