A survey was carried out to assess the resource use efficiency of Rainbow Trout production under OVOP in Nuwakot -Rasuwa corridors, Nepal 2010. The result showed that the cost of feeding accounted for the largest proportion (24.53%) of the total cost of Rainbow Trout production, followed by cost of labour (22.79%).The fingerlings cost and other input cost accounted for 12.7% and 7.87% of the total cost respectively..The rate of return on investment was 0.33 implies. The implication of this is that there is a considerable level of profitability in Rainbow Trout farming in the study's findings area. The result revealed that the rate of return per capital invested of 200% is greater than the prevailing bank lending rate 15% implying that Rainbow Trout in the study area is profitable. The result shows that value of output of Rainbow The total sum of elasticises of production of the significant variables, 0.932 was less than unity. This suggests that fish production in the study area had a decreasing return .This shows that production occurred among fish farmers in the study in stage 2, a rational stage of production.