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¹ Faculty of Agriculture, Adnan Menderes University, Aydin,Turkey DOI : 10.17693/yunusae.v17i27092.270200 Viewed : 4145 - Downloaded : 2576 In the present study we investigated the effects of phytoadditive carvacrol and thymol on growth performance and feed utilization of Pangasius hypophthalmus. In trial, 840 Pangasius hypophthalmus which had average weight of 1.33 ± 0.05 gram was used. Fish were divided into seven groups before being fed for 90 days with 0, 1 (C1), 3 (C3), 5 (C5), 1(T1), 3(T3), 5(T5) g/kg of carvacrol and tymol. All treatment groups were planned three replicate and randomly plots method and fish were distributed to groups. It was determined that 3 g/kg timol addition to feed provided the best result in terms of growth performance. Keywords : Pangasius hypophthalmus,Karvacrol,Thymol,Growth performance,feed utilization