الفهرس 
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Abstract
from the previous study it could be concluded that:-
6- The treatment 19 (SD60*DS200*FAa) in both the 1st and the 2nd experiments achieved the highest total seed production (27.477.99 and 28.089.95 fry/pond, respectively).while, the lowest values were for treatment (SD50*DS350*FAc) which were. 21600, 21899 For exp. 1 and exp. 2, respectively.
7- Concerning the economic efficiency for the Nile tilapia spawning process outside the normal season and within the normal season and within the normal season showed that the total production of Nile tilapia fry was 28.089 within the normal spawning season,. it increased by 2.23% than that for the outside the normal season
8- The total revenue and net income under the hatchery condition in the out off-season was higher than that in the normal season by 22.01%. This due to the price of tilapia fry in the winter months is higher than the summer to supply shortage in winter and incensed demand at the same time.
9- from the exp. 3th the diet treated with XPC at stocking density 50000 fry/pond achieved the highest values for growth performance and feed utilization followed by the diet treated with Xylam then, the diet treated with NFH at the same density.
10- from the Exp. 4 the results indicated that, used the different feed additives at 0.125% and stocking density 150 fish/ happa achieved the best values for both growth performance and feed utilization parameters.