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DOI : 10.17693/yunusae.v16i26717.281025 Viewed : 3297 - Downloaded : 2080 In this research, rainbow trout had been stocked for 4 months (from December 2005 to April 2006) in a net-cage farm which was operating in Kuzgun Dam Lake (Ilıca-Erzurum) without feeding. Specimens were collected before and after long term fasting in order to investigate the effect of starvation on some productivity traits and body composition. Research results were showed that 171.73±11.23 g initial mean weight was decreased to 126.58±15.17 g after four months and then fish were recovered and reached to 191.25±33.49 g main weight after 2 months later. Similarly, condition factor had been decreased from 1.63±0.03 to 0.96±0.04 after 4 months and then became 1.57±0.09 fallowing two months. The initial carcass yield was increased from 82.37±0.7 % to 85.14±0.32 % at the end of 4-month starvation period; however visceral index decreased from 13.27±0.56 % to 9.08±0.17 %. Long term starvation did not affect crude protein and crude ash rate statistically, but crude fat rate was affected. The fat rate was decreased from 13.19±1.07 % to 9.44±0.56 % after long term starvation, and then increased to 13.9 % in fallowing months. Keywords : Growth,condition factor,weight,loss,flesh,quality