The effects of age and individual size on the Fatty Acids and Elemental Composition of Nemipterus Randalli Russell, 1986 from Mersin Bay, Turkey

Abstract

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), oleic acid (c18: 1), cetoleic acid (C22: 1 n11), eicosapentaenoic acid (EPA, C20: 5 n3), and docosahexaenoic acid (DHA, C22: 6 n3). 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 oleic 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 was changed according to different age groups as K>P>Na>Mg>Ca>Fe>As>Zn, respectively. For 1+ age group Na: 2685.1, Mg: 974.3, P: 11492.0, K: 24557.0, Ca: 348.6, Fe: 27.6, Zn: 8.4, As: 44.6 (μg g-1dw). For the 2+ age group Na: 4959.7, Mg: 1146.9, P: 11362.0, K: 21342.0, Ca: 725.5, Fe: 41.7, Zn: 10.3, As: 39.5 (μg g-1dw). For the 3+ age group Na: 7758.8, Mg: 1539.8, P: 11283.0, K: 19567.0, Ca: 1194.7, Fe: 53.3, Zn: 9.2, As: 275.0 (μg g-1dw).

Keywords

• Mersin Bay
• Nemipterus randalli
• Age
• Lipid
• Fatty acids

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