A total of 45 samples of fish (Tilapia Nilotica and Claris Lazera) were collected from EL-Bagoria canal and EL
Menofy drainage and Bahr Shibin for detection and determination of Organochlorine pesticides (DDT, aldrin and
dieldrin). Organochlorine pesticides could not be detected in Bahr Shibin while mean value of DDT in Tilapia
Nilotica from EL-Bagoria canal was 0.37±0.09, mean level of aldrin was 0.33±0.03 and mean level of dieldrin was
0.50±0.20 while in EL-Menofy drainage mean level of DDT was 0.34±0.07, mean level of aldrin was 0.40±0.08 and
mean level of dieldrin was 0.40±0.13. While in Claris Lazera samples from EL-Bagoria canal mean level of DDT
was 0.40±0.06, mean level of aldrin was 0.25±0.07and mean level of dieldrin was 0. 34±0.08 while from EL-Menofy
drainage mean value of DDT was 0.27±0.05, mean level of aldrin was 0.30±0.07 and mean level of dieldrin was
0.48±0.10. Pesticides are major pollutant of water sources which are considered the natural habitat of fish On the
other hand , fish could be contaminated by pesticides either directly by gills breathing or indirectly through
contamination of feeding items so it is very important to analyze fish samples to detect to what extent the rate of
accumulation of pesticides residues in fish flesh and organs.