PRELIMINARY STUDIES ON THE USE OF NILE TILAPIA (OREOCHROMIS NILOTICUS) AND SOME ALGAL GENERA: CHLORELLA
SOROKINIANA AND SCENDESMUS DIMORPHUS IN BIODEGRADATION OF SOME ORGANOPHOSPHORUS PESTICIDES
Olfat, A. Radwan1; Ashraf, A. El-Badawi2;
Tartiel, M. Badawy2 and Ahmed, D. El-Gamal3
1Central Agricultural Pesticides Lab. Agricultural Research Center,Ministry Of Agriculture, Egypt.
2 Central Laboratory For Aquaculture Research, Agricultural Research Center, Ministry Of Agriculture, Egypt.
3 Biology Dept., Umm AlQura Univ., Makkah, P.O.Box 2064, Saudi Arabia.
Received 8/ 11/ 2010 Accepted 27/ 12/ 2010
The present study was undertaken to investigate the degradation of dursban and pestban formulations sub -lethal concentrations of malathion , by using Nile Bolti and two different algal species, Chlorella
sorokiniana and Scendesmus dimorphus. Determination of the insecticides residues levels of treated tap and aquaria water, either with fish liver, gills, muscles and brain tissues or with whole algae exposed to pesticides was done at zero, 1, 3, 5, 24 and 48 hour post- treatment. The percentage loses of malathion, dursban and pestban formulations were increased by lapse of time. The rate of malathion formulation persistent was higher than dursban and pestban in both tap and aquaria water when compared with both algae. The degradation rate of dursban formulation was higher with Scendesmus dimorphus than with Chlorella
sorokiniana. On contrast, the degradation of pestban formulation was higher with Chlorella
sorokiniana than with Scendesmus dimorphus. The different components of malathion and two formulations of chlorpyrifos (dursban and pestban) was estimated and identified by using GC/ MS.