In this study, the effects of the age and individual size on total lipid content, fatty acids and elemental composition of Nemipterus randalli caught from the Mersin Bay were determined. The lipid content of all age groups was found at similar levels. However, the highest lipid level was determined in the 3+ age group (2.85%) while the lowest level was found in the 2+ age group (2.75%). Dominant fatty acids for each age group of N. randalli are palmitic acid (C16:0), stearic acid (C18:0), vaccenic acid (C18:1n7c), cetoleic acid (C22:1n11), eicosapentaenoic acid (EPA, C20:5n3), and docosahexaenoic acid (DHA, C22:6n3). The highest palmitic acid level was found in 3+ age group (20.45%) whereas the highest stearic acid level was found in the 2+ age group (15.00%). The highest vaccenic acid level was observed in the 3+ age group (6.47%) while the highest level of the cetoleic acid was observed in the 2+ age
group (7.13%). The highest EPA and DHA were found to be 5.49% and 22.02% in the 1+ age group. Macro elements (Na, Mg, P, K), trace elements (Cu, Zn, Fe) and potentially toxic metals (Cd, Cr, Pb, As) were investigated in muscle tissue and the levels of Cr, Cu, Cd and Pb were not evaluated since their levels were below the detection limit of the device (ICP-MS). Element level of muscle tissue changed according to different age groups as K>P>Na>Mg>Ca>Fe>As>Zn, respectively.