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Abstract
All results indicated that the total production and other growth performance parameters decreased significantly (p<0.05) with the increasing stocking density . And also the possibility of fingerlings production to be ready for restocking through the marketable production stages during the same season
1- The design of unite square and circular tank and aeration holes number have a great effect in increasing the fish production.
2- on the basic of previous results can be recommended using the circular tank shap Because they maintain the water quality of the content of oxygen and ammonia and acidity and alkalinity and salinity as well as easy cleaning
3-The use of stocking density of fish within the tank average of 100 fish / m3 And for its superiority in various stages of growth and with aeration holes number of 7 holes in upper meter For the same amount of air in order to obtain higher productivity and net profit.