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¹ Sinop University, Fisheries Faculty, Department of Aquaculture, 57000, Sinop, Turkey DOI : 10.4194/1303-2712-v17_6_36 Viewed : 3992 - Downloaded : 3220 The aim of this study was to determine the changes in essential amino acids related to the growth of sea bass (Dicentrarchus labrax) from the first stocking in cages to the harvesting in production areas at the Aegean and the Black Seas. The highest levels of essential amino acids at the beginning of the trial were in lysine, leucine and threonine, while the highest levels of essential amino acids at the end of the trial at both production area were in lysine, leucine, threonine and isoleucine. The total essential amino acid value of 9.47±0.02 at the beginning of the study exhibited irregular fluctuations between the periods and was 10.45±0.01 and 9.70±0.01 at the Aegean and the Black Seas, respectively at the end of the study. In the study, it was determined that there was a reverse relation between the water temperature and the total essential amino acid values in both production areas, and the observed differences in some amino acids were related to the water parameters and the changes in amino acid metabolism due to the growth of the fish. Keywords : Sea bass, Dicentrarchus labrax, The Aegean Sea, The Black Sea, essential amino acids