الفهرس 
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Abstract
The study aims to evaluate pollutants in particular heavy metals(Fe, Mn,Cu, Zn, Ni, Cd and Pb) in water,sediments, fish and phragamites australis.24 sites were selected in both lakes(El Burullus and El Manzala Lakes) Determination of heavy metals concentrations in sediments, water, muscles of tilapia fish (Oreochromis niloticus) and aquatic plant of two Lakes during the four seasons, 2015 Study of some physico-chemical parameters of water and sediments of two Lakes during four seasons, The thesis included the following major taskes Analysis of physical and chemical properties as well as heavy metals of water, sediment,fish and phragmites australis - The annual mean of heavy metals in sediment collected from Lake Burullus were 47585.6, 4357.7, 120.8, 371.5, 143.9, 2.0 and 14.9µg/g for Fe, Mn, Cu, Zn, Ni, Cd and Pb, respectively. While in Lake Manzala, they were 36972.3, 2293.3, 106.3, 374.3, 127.5, 2.6 and 160.9µg/g for Fe, Mn, Cu, Zn, Ni, Cd and Pb, respectively. - The annual means of heavy metals in Burullus Lake surface water were Fe (16179.2), Mn (334.2), Cu (175.8), Zn (344.2), Ni (405.9), Cd (368.8) and Pb (75.1) µg/l; with the order of Fe > Ni > Cd > Zn > Mn > Cu > Pb.while in lake Manzala surface water were Fe (10562.5), Zn (498.3), Ni (393.8) , Cd (386), Mn (257.5), Cu (187.5) and Pb (72.1) µg/l; with the order of Fe > Zn > Ni > Cd > Mn > Cu > Pb. - The annual means of heavy metals in Oreochromis niloticus fish collected from Lake Burullus were Fe (20.56), Mn (0.51), Cu (0.55), Zn (4.70), Ni (0.25), Cd (0.02) and Pb (0.17) µg/g. The annual means of heavy metals in Oreochromis niloticus fish collected from Lake Manzala were Fe (20.56), Mn (0.51), Cu (6.29), Zn (1.17), Ni (0.57), Cd (2.12) and Pb (0.57) µg/g. In lake Burullus, the accumulation levels of metals in muscle tissues were detected in the following order: Fe > Zn > Cu > Mn > Ni > Pb > Cd. While in Lake Manzala, the accumulation levels of metals in muscle tissues were detected in the following order: Fe > Cu > Cd > Zn > Pb=Ni > Mn - The annual mean of heavy metals in floated plant parts of Lake Burullus were 805.42, 36.44, 20.61, 40.47, 10.03, 0.08 and 3.61µg/g for Fe, Mn, Cu, Zn, Ni, Cd and Pb, respectively. While in Lake Manzala, they were 1290.67, 50.35, 15.76, 64.63, 4.64, 0.05 and 5.53µg/g for Fe, Mn, Cu, Zn, Ni, Cd and Pb, respectively. Based on the results obtained, the study recommends the following: Treatment of different wastes before being drained into the lakes. Conserving the biodiversity in the lakes such as: plants, migratory birds and other living organisms. Prohibit uncontrolled fishing or drying parts of lakes. Provide awareness to the community about the importance of the Lakes. Providing the decision makers with data base.