in net-cages in Kuzgun Dam Lake (Erzurum-Turkey) without any feeding. Specimens were collected before and after long term fasting in order to investigate effect of starvations on some productivity traits and body composition of fish. Fish were fed daily by commercial trout feed after May 2006. At each sampling time, 15 fish were sampled from square wooden net cages (5*5*8 m) for analysis. Research results showed that 66.10±4.42 g initial mean weight was decreased to 44.99±4.40 g after five

more »

... s and then fish were recovered and reached to 148.11±13.00 g main weight. Similarly, condition factor had been decreased from 1.19±0.028 to 0.79±0.02 after 5 months and then it was increased as 1.54±0.053 fallowing two months. After wintering, carcass yield was increased from 82.86±0.7% to 84.16±1.40%. Long term starvation did not affect raw protein rate statistically before and after wintering. However, raw fat rate was decreased from 2.67±0.17% to 1.44±0.17% after long term starvation, and then raw fat rate increased up to 3.70 ±0.25% in fallowing months.