This study was carried out in Yumurtalik Marine Research Station, University of Cukurova in Turkey. In this study was aimed to determine the effects of different levels of soybean oil and fish oil on growth and body fatty acid composition of sea bass (Dicentrarchus labrax). Initial mean body weights of test subjects were 4.80 +/- 0.25 g. The fish were housed within experimental, 210 1 of experimental fiberglass tanks (20 fish/tank). Fish of all groups were fed on five different levels feed a 105 day period. The fish group fed with Diet I (12% Fish Oil = FO) followed by Diet 5 (12% Soybean Oil = SBO) showed the highest growth performance. In this Study saturated, monounsaturated and polyunsaturated fatty acid changes in all groups were significant (p>0.05). On the basis of these results it call be concluded that soybean oil could be used as a partial dietary substitute for fish oil within compound feeds for sea bass.