الفهرس 
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Abstract
The objective of the study was to evaluate the effects of natural zeolite levels in fish diet on water quality, growth performance, feed utilization, chemical body composition, blood analysis resistance to high ammonia level and economical evaluation of Nile tilapia, O. niloticus Fingerlings were investigated through-out an 84-days period. Each experimental diet was applied to triplicate groups of 13 fish (mean wet weight 10±0.01 g). Fish were fed, two times a day with diets containing 30 % (crude protein) and 8% (lipid) supplemented with 0 (control), 1, 2 and 3 % zeolite (clinoptilolite). Results could be summarized as follows: Groups fed diets with zeolite had higher growth parameters and better feed utilization than those fed diet without zeolite (p<0.05).The best treatment in all of growth parameters and feed utilization was 3% zeolite. Groups fed diets with zeolite had a lower value of total ammonia nitrogen (TAN) than control group (p<0.05). Fish was fed diet with 3% Zeolite more resistance to high ammonia level in the ammonia challenge test than other groups. In conclusion, zeolite as feed additive improved water quality, enhanced growth performance and feed utilization, economical evaluation, of Nile tilapia O. niloticus