Elif İpek CENGİZ, Erhan ÜNLÜ, MEHMET BAŞHAN, ALİ SATAR, ERSİN UYSAL

Effects of seasonal variations on the fatty acid composition of total lipid, phospholipid and triacylglicerol in the dorsal muscle of mesopotamian catfish (Silurus triostegus heckel, 1843 ) in tigris river (Turkey)

Silurus triostegus’un dorsal kasındaki total lipit, triaçilgliserol ve fosfolipitin yağ asit kompozisyonu üzerindeki mevsimsel etkiler, gaz kromatografisi ile (GC) belirlendi. Total çoklu doymamış yağ asitleri (PUFA) ve tekli doymamış yağ asitleri (MUFA), total lipitin en önemli gruplarıydı ve istatistiksel olarak (p

Anahtar Kelimeler:

sucul hayvanlar, kimyasal bileşim, dokosahekzaenoyik asit, linoleik asit, lipit, kaslar, oleik asit, palmitik asit, mevsimsel değişimler, kış, triyosilgliserol, mevsime bağlılık, fosfolipit

Dicle Nehri’ndeki (Türkiye) Mezopotamya yayın balığı’nın (Silurus triostegus heckel, 1843) dorsal kasındaki total lipit, fosfolipit ve triaçilgliserolün yağ asit kompozisyonu üzerinde mevsimsel değişimin etkileri

The seasonal effects on the fatty acid composition of total lipid, triacylglicerol and phospholipid in the dorsal muscle of Silurus triostegus were determined by gas chromatographic (GC) method. The total polyunsaturated fatty acids (PUFA) and monounsaturated fatty acids (MUFA) were the most important groups of total lipid and statistically ranged (P<0.05) from 33.88% to 55.85% and from 23.37% to 38.71%, respectively. The major fatty acids of total lipid in all seasons were palmitic acid (16:0) in SFA, oleic acid (18:1) in MUFA, linoleic acid (18:2) in n-6 PUFA, and docosahexanoic acid (22:6, DHA) in n- 3 PUFA. In the present study, n-3/n-6 ratios of total lipid were 2.47, 1.20, 1.03 and 1.40 in spring, summer, autumn and winter, respectively. It was determined that MUFA and PUFA were the most important groups of triacylglicerol and statistically ranged (P<0.05) from 34.09% to 47.02% and from 33.13% to 46.12%, respectively. The main fatty acids of triacylglicerol were palmitic acid in SFA, oleic acid in MUFA and linoleic acid in PUFA. PUFA was the most important group of phospholipid except summer. The total PUFA percentages of the phospholipid statistically ranged (P<0.05) from 38.12% to 65.75%. The major fatty acids identified in the phospholipid were palmitic acid in SFA, oleic acid in MUFA, arachidonic acid (20:4, AA) in n-6 PUFA and DHA in n-3 PUFA in all seasons. DHA was very high in winter (30.41%). It was shown that the fatty acid compositions in the muscle of fish were significantly influenced by seasons.

Keywords:

aquatic animals, chemical composition, docosahexaenoic acid, linoleic acid, lipids, muscles, oleic acid, palmitic acid, seasonal variation, winter, triacylglycerols, seasonality, phospholipids,

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