Abant trout (Salmo trutta abanticus) were reared in mono- and duoculture with brook trout (Salvelinus fontinalis) for 140 days to assess the effects of culture strategy on its survival and growth rate. Except survival rate, the growth of abant trout was significantly better in monoculture compared to duoculture. The survival rate of abant trout was 10% higher in duoculture. However, the survival rate and growth of brook trout were found similar in both cultures. The length weight relationship for both species were also determined and could be summarized by the equation W=0.009L(3.032) (r(2)=0.89), W=0.006L(2.831) (r(2)=0.92) for brook trout in mono- and duoculture, W=0.007L(3.161) (r(2)=0.95), W=0.009L(3.62) (r(2)=0.93) for abant trout in mono- and duoculture respectively. The feed conversion ratio (FCR) was significantly higher in monocultures than duoculture. The duoculture of both species gave the lowest FCR.