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

Year 2018, Volume: 1 Issue: 3, 100 - 113, 28.09.2018

Necla Göçmen Selmin Özer Deniz Ayas

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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