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¹ Mugla University, Fisheries Faculty, Department of Aquaculture, 48000 Kötekli, Mugla, Turkey DOI : 10.4194/1303-2712-v11_3_08 Viewed : 4498 - Downloaded : 4412 Juvenile of rainbow trout (Oncorhynchus mykiss, weight 27.39±0.16 g) were reared under four photoperiods (Light/Dark hour) (11L:13D control group; 24L:0D continuous light group; 18L:6D extended light group and 6L:18D short light group) to examine their growth performance and some feeding parameters in sea water conditions. Fish were fed on a commercial diet until satiation for 8 weeks of the trial. Fish exposed to 24L:0D (continuous light group) had a significantly higher daily growth rate, relative growth rate and specific growth rates followed by 18L:6D, 11L:13D and 6L:18D photoperiods (P<0.05). The results demonstrated that the growth performance and feed utilization of rainbow trout can be stimulated clearly by using a continuous (24L:0D) or extended light (18L:6D) photoperiods in sea water. Keywords : Rainbow Trout, Oncorhynchus mykiss, Juvenile, Photoperiod, Growth, Feeding, Sea Water