الفهرس 
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Abstract
A 56-days growth trial was conducted in happa under greenhouse culture system to examine the effects of different added vitamin C on growth, feed utilization survival rate of Nile tilapia (Oreochrmisniloticus). Fingerlings with average initial weight of 8.12 ± 0.02 g. Five treatments
T1 control dry added vitamin C
T2 mix Vitamin C with water
T3 mix vitamin C with oil,
T4 spry added vitamin with water
T5 spry added vitamin C with oil.
The levels of vitamin C (70 mg/kg).
and their combination were used to prepare diets used in nine experimental treatments with three replicates. The results revealed that T5 was the best in terms of growth performance, feed utilization and survival rate.
Based on the results of this study, it can be conclude that addition of vitamin C with oil spry added was the best in terms of growth performance, feed utilization and survival rate.