الفهرس 
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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