الفهرس | Only 14 pages are availabe for public view |
Abstract The present study aimed to investigate the most popular pollutants (malathion and glyphosate) residue in water samples (84 sample) collected from different fisheries at summer season. Then, studying the effect of malathion and glyphosate on fish and role of dietary organic selenium in improving health status of exposed tilapia. Results during the field survey revealed higher levels of malathion than permissible limits in almost fish farms while glyphosate levels was within acceptable levels in all fish farms. A total of 210 apparently healthy fresh tilapia (Oreochromis niloticus) with average body weight 14±0.5 g were adapted under laboratory conditions for two week and then they were randomly divided into 7 groups: CON: served as control, GLY: (glyphosate 2 mg /L and commercial diet), MAL: (malathion 0.5mg /L and commercial diet), GLY+ OSe: ( glyphosate 2 mg /L and OS diet), MAL+ OSe: ( malathion 0.5mg /L and OS diet), GLY+MAL+ OSe: (malathion 0.3 mg/L and glyphosate 1.6mg/L and OS diet) and GLY+MAL: (malathion 0.3 mg/L and glyphosate 1.6mg/L and commercial diet). The examined pollutants impact were investigated at different periods of the experiment (30, 45 and 60 days) by measuring the following parameters: Growth performance index (body weight gain and FCR), some hematological (Hb, RBCs, Ht, Thrombocytes and WBCs) and biochemical parameters (Total protein, Albumin, AST, ALT, Urea and Creatinne), anti-oxidant status (MDA, SOD and GPX) and finally fish were experimentally infected with Aermonus hydrophilia, then observed and examined for A. hydrophilia count in liver and kidney samples. The results revealed that the hazards caused by malathion were more prominent than that caused by glyphosate, malathion was more toxic to tilapia than glyphosate. Adding of organic selenium (0.8 kg-1 diet) was capable to enhance fish antioxidant status and relief the damage caused by malathion and /or glyphosate |