A total of 90 samples of fish (each 45 samples of Tilapia Nilotica and 45Claris Lazera) were collected from EL
Bagoria canal, EL-Menofy drainage and Bahr Shibin in Menofia governorate and analyzed to detect and
determine Organochlorine (DDT, aldrin and dieldrin) and organophosphorus (diazinon, Malathion and
chlorpyrifos). Organochlorine and organophosphorus 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, aldrin was 0.33±0.03and dieldrin
was 0.50±0.20 while in EL-Menofy drainage mean level of DDT was 0.34±0.07, aldrin was 0.40±0.08 and
dieldrin was0.40±0.13. While in Claris Lazera samples from EL-Bagoria canal mean level of DDT was
0.40±0.46, aldrin was 0.25±0.07and dieldrin was 0.34±0.08 while from EL-Menofy drainage mean value of
DDT was 0.27±0.05, aldrin was 0.30±0.07 and dieldrin was 0.48±0.10. Concerning organophosphorus
compounds, no diazinon was recorded in Tilapia Nilotica from EL-Bagoria while mean level of Malathion from
EL-Bagoria was 5.50±2.0, the mean level of chlorpyrifos was 5.0±1.66.whie from EL-Menofy drainage the
mean level of diazinon was 3.33±0.65, the mean level of Malathion was 4.98±1.22 ,the mean level of
chlorpyrifos was 3.0±0.71.while in Claris Lazera samples from EL-Bagoria there were no diazinon , no
Malathion no chlorpyrifos while from EL-Menofy drainage ,the mean level of diazinon was 6.8± 1.42 , the
mean level of Malathion was 4..64±0.81 and the mean level of chlorpyrifos was 4.0±0.96. Pesticides are one
the main contaminants of water sources that act as the natural environment of fish. On the other hand, fish
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. |
