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¹ South Bohemian Research Centre of Aquaculture and Biodiversity of Hydrocenoses, Faculty of Fisheries and Protection of Waters, Vodnany, Czech Republic DOI : 10.4194/1303-2712-v20_02_02 Viewed : 6050 - Downloaded : 4464 The aim of this study was to compare the grow performance of two rheofilic fish species at different water temperatures (WT) under recirculation aquaculture system (RAS) conditions. Two six-month experiments were conducted during two consecutive winter seasons with the five-month-old nase Chondrostoma nasus (Linnaeus, 1758) and vimba bream Vimba vimba (Linnaeus, 1758) which had been trained on pellet feed and acclimated to four different temperatures. The three experimental groups were reared in closed separate RAS systems with the WT about 15°C, 18°C and 21°C respectively together with a fourth controlled group which were kept in a flow through system simulating ambient outside conditions at an average of approximately 4°C. All monitored parameters, total length (TL), (BW) body weight, specific growth rate (SGR) and food conversion ratio (FCR) were significantly greater with increasing of temperature in all groups for both fish. The nase total length gained 73.37±3.82, 94.11±5.58, 108.68±7.07 and 128.52±7.64 mm and body weight 2.85±0.47, 6.14±1.20, 9.26±2.14 and 16.71±3.46 g in 4, 15, 18 and 21°C, respectively. The same pattern was observed in vimba bream (TL 58.32±2.71, 69.33±6.68, 91.28±7.48 and 102.16±7.80 mm and BW 1.57±0.24, 2.71±0.50, 6.81±1.96 and 8.88±2.52 g). Keywords : Vimba bream, Nase, Temperature, SGRw, FCR, RAS, Restocking