الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 81 |  |  |
| | | from | 81 | | |
Abstract
Objectives:A total number of 750 mono-sex Nile tilapia with an average initial body weight of 52.6 ± 0.40 g were used in five experimental treatments (150 fish / hapa / treatment, 10 fish / m3) to evaluate two dietary crude protein levels (25 and 30 %) and two crude fat levels (2 and 6 %) from three fat sources (corn oil, imported fish oil, and a new local commercial source of fatty acids named Aquafat-omiga). Fish were stocked into net hapas, each hapa has the dimensions 3 x 5 x 1 m.Methods & Results:Fat sources were extra mixed with the basal diets which contained basically 14.32 and 15.63% fat in the 30 and 25% CP-diets, respectively. Fish fed the experimental diets at a daily feeding rate of 3% of their live body weight six days a week. Experimental diets were handily introduced two times daily at 8 a.m. and 2 p.m. The study was evaluated via some determinations, measurements, and / or calculation of water quality criteria, growth performance, feed and nutrients utilization.Conclusion:from the view point of the producers, 2 % fish oil supplemented diet (25 % protein) is the most economic diet (lowest feed intake, best feed conversion and feed efficiency) followed by that (25 % protein) supplemented with 2 % Aquafat-omiga. But from the view point of the consumers, 30 % crude protein diet plus 6 % addition corn oil gave best body gain and fish carcass protein besides lowest fat and ash in fish body and lowest serum cholesterol, uric acid, and cortisol. So, it could recommend using the first diet containing 30 % crude protein and supplemented with extra 6 % corn oil. Particularly, fish oil is rear, unavailable, imported, and expensive.