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¹ Su Ürünleri Araştırma Enstitüsü Müdürlüğü, Elazığ
² Fırat Üniversitesi Veteriner Fakültesi Zootekni ve Hayvan Besleme Bölümü, Elazığ DOI : 10.17693/yunusae.vi.289480 Viewed : 4739 - Downloaded : 2139 In this study was aimed to determine the growth performance of rainbow trout (Onchorhynchus mykiss, Walbaum 1792) fry fed with feed containing essential oils rosemary, cloves and rosemary + clove at different rates. In research, rainbow trout fries were used which initial weight 30 ± 5 g. Experimental groups are that rosemary, clove and rosemary + clove essential oils added the diets. These groups were as follow: Control group (no added any additive), % 0.5 Rosemary oil added R-0.5, % 1 Rosemary oil added R-1, % 1.5 Rosemary oil added R-1.5, % 0.5 Clove oil added C-0.5, % 1 Clove oil added C-1, % 1,5 Clove oil added C-1.5, % 0,5 Rosemary + Cove oil added RC-0.5, % 1 Rosemary + Cove oil added RC-1, % 1,5 Rosemary + Cove oil added RC-1.5 group. Experiment lasted 60 day. Taken measured values were recorded in fish during trial. At the end of the study it was calculated growth parametres; average live weight, daily absolute live weight gain, relative growth rates, specific growth rate, condition factor with viserosomatic and hepatosomatic factor. The findings obtained in the study were subjected to analysis of variance and the importance degree of difference between the groups was determined by Duncan's multiple comparison test. In the light of statistical data, daily absolute live weight gains with the viserosomatic and hepatosomatic index values were found to be significant differences between all groups (p <0.05). Keywords : Rosemary, clove, rainbow trout, growth performance