الفهرس | Only 14 pages are availabe for public view |
Abstract Environmental pollution especially by insecticides which used in agriculture and industry is increasing with the days. Chlorpyrifos is organophosphorous insecticide and one of the most used insecticides in Egypt. Cypermethrin is synthetic pyrethroids insecticides and fish absorbed it from water through gills even present in very low concentration. A total number of 400 apparently healthy a live O. niloticus with an average body weight (25±0.5 g) obtained from Abbassa fish hatcheries at Sharkia province were used in 2 experiments. First experiment, a total number of 100 fish were used for studying the subacute effect of exposure of O. niloticus to chlorpyrifos and cypermethrin insecticides at concentration 1/2 and 1/3 96 hrs LC50 on health condition, were divided into 5 equal groups. The group 1 was kept as control. The groups 2 and 3 were exposed to 1/2 and 1/3 96 hrs LC50 of chlorpyrifos, respectively. The groups 4 and 5 were exposed to 1/2 and 1/3 96 hrs LC50 of cypermethrin, respectively. Second experiment, 300 fish were used for studying effect of chronic toxicity (1/10 and 1/20 96 hrs LC50) of chlorpyrifos and cypermethrin insecticides with or without lycopene or PPE supplementation on health condition and growth of O. niloticus, were distributed into 15 equal groups (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 and 15). The first group was kept as control. Groups 4, 8 and 12 were exposed to 1/10 (2.64 μg/L) 96 hrs LC50 of chlorpyrifos. Groups 5, 9 and 13 were exposed to 1/20 (1.32 μg/L) 96 hrs LC50 of chlorpyrifos. Groups. |