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¹ Lorestan University, Faculty of Natural Resources, Department of Environmental and Fisheries Sciences and Engineering, Khorramabad/ Lorestan Province, Iran DOI : 10.4194/TRJFAS27992 Viewed : 184 - Downloaded : 132 Data collection and field sampling for cage culture site selection at Seymareh reservoir in western Iran were conducted monthly from February 2022 at three stations and 15 depths, using 11 water quality factors. The most determinative factors were water temperature, dissolved oxygen, phosphorus, and nitrogen, respectively. The fish culture time frame is proposed to be December to April for rainbow trout and May to November for common carp. The fish weight for introduction to the cages is proposed as 100g and150g for rainbow trout and common carp, respectively. According to the acceptable dissolved phosphorus levels in the water and the predicted release of phosphorus from fish culture activities, the rainbow trout production capacity has been calculated to be 2467.44 tons/yr. The fish production strategy was proposed as the gradual increment of fish production over 4 years (25% per year) and continual assessment of the water quality to prevent any unwanted consequences on the water quality. Finally, according to the results, it was confirmed that the Seymareh reservoir is suitable for cage culture activities, and the optimum site selection was performed for fish cages and supplementary structures using available geographical raster data layers based on Boolean criteria in the GIS package. Keywords : Aquaculture Cage culture Cold water fishes Fisheries Inland waters