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¹ Department of Fisheries and Aquaculture, Vocational Schools, Sinop University, Sinop, Turkey
² Department of Aquaculture, Faculty of Fisheries and Aquaculture, Sinop University, Sinop, Turkey DOI : 10.4194/1303-2712-v15_1_13 Viewed : 5767 - Downloaded : 4554 In the research, the effects of diets, including hazelnut meal supplemented with synthetic lysine and methionine, on development of rainbow trout were investigated. Six isonitrogenous and isocaloric diets were prepared. One of them was a fish meal based on control diet and the others were diets containing hazelnut meal (HM) with the increasing percentages as follows: 10 %, 20, 30, 40 and 50. In order to balance lysine and methionine of the diets as much as possible, synthetic lysine and methionine were added to each diet except the control diet which was based on the lysine and methionine content of the control diet. Rainbow trouts (114.16±0.03 g) were stocked in three replications for each group and fed with test diets twice a day until apparent satiation during 60 days. There were no significant differences among groups in terms of specific growth rate, feed conversion ratio, protein efficiency ratio and productive protein value. However, the best values were obtained from 40 % HM group (P ˃ 0.05). The results showed that the protein digestibility was not affected from the HM ratio in the diet. Nevertheless, the total digestibility and lipid digestibility were decreased with respect to the increase of HM ratio in the diet to 50 % (P < 0.05). In conclusion, this research has shown that the HM supplemented with synthetic lysine and methionine could be best used at the rate of 40 % in rainbow trout diets. Keywords : Hazelnut meal, rainbow trout, lysine, methionine, growth