Mohamed Attia Sheradah*, Amany Ahamed El-Sikaily, Nehad Mohamed Abd El-Moneam, Nabila El Sayed Abdel Maguid and Marwa Gaber Zaki Pages 168 - 184 ( 17 )
Aim: The present study aimed to investigate concentrations of PCBs and pesticides in sediments and muscle tissues of Siganus rivulatus from El-Mex Bay and Marsa Matrouh areas.
Method: In general, concentrations range of PCBs and pesticides detected by GC-Ms in sediment samples revealed much more pollution in El-Mex Bay by PCBs and pesticides than Matrouh area. The present study indicated that concentrations of PCBs in sediments from El- Mex Bay were 9-fold more than those from Matrouh coast. Variations of pesticide concentrations in sediment samples were mainly due to the ongoing processes of adsorptiondesorption and uptake by living organisms. In the meantime, the concentrations of PCBs in fish from El-Mex Bay were 11.5-fold more than those from Matrouh coast. Similarly, the concentrations of total pesticides in fish collected from El-Mex Bay were 7-fold more than those collected from Matrouh coast.
Result: Generally speaking, sediment samples had higher concentrations of PCBs and pesticides than fish samples reflecting its great capacity to absorb and accumulate such pollutants. The present study revealed also the presence of low concentrations of DDT metabolites and indicator PCBs in both areas. It reports important information regarding the presence of p,p’-DDE, p,p’- DDD, PCB 52 and PCB 153 in almost all fish samples from the two Egyptian coastal lagoons which are mainly due to a previous use of DDT in agricultural activity, high environmental persistence because of their chemical and thermal stability, different climatic environmental conditions, marine currents, different migratory and feeding habits of aquatic organisms.
Conclusion: Although relatively high pesticide contamination still occurs, few studies are available and data are scarce not only in terms of the number of listed PCBs that have been analyzed but also in terms of their long-term screening.
PCBs, pesticides, sediments, Siganus rivulatus, Egyptian Mediterranean Coast.
Marine biotechnology and natural products lab, National Institute of Oceanography & Fisheries, Alexandria, Marine Pollution Lab, National Institute of Oceanography & Fisheries, Alexandria, Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, Zoology Department, Faculty of Science, Alexandria University, Alexandria, Marine Pollution Lab, National Institute of Oceanography & Fisheries, Alexandria