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Research Journal of Environmental Sciences
Year: 2009  |  Volume: 3  |  Issue: 3  |  Page No.: 376 - 383

Seasonal Variations of Fatty Acid Contents of Saccostrea cucullata at Intertidal Zone of Chabahar Bay

N. Sajjadi, P. Eghtesadi-Araghi, A. Mashinchian, S. Jamili, S. Farzadnia and M.S. Hashtroodi    

Abstract: Seasonal variations of fatty acids were studied in the lipid fractions of the bivalve mollusk, Saccostrea cucullata, at the intertidal zone of Chabahar bay in the northern part of Oman Sea (Iran). Samples were collected in rocky shores between two stations. The analysis were carried by GC/MS chromatography. Thirteen fatty acids were identified, of which, the most important saturated fatty acids (SFA) were 14:0, 4, 8, 12 tri Me- 13:0, 16:0 and 18:0, the mono unsaturated fatty acids (MUFA) included 16:1n-9, 18:1n-9 and 20:1n-11, the polyunsaturated fatty acids (PUFA) were linoleic acid 9,12 18:2 , eicosapentaenoic acid EPA 20:5n-3 and arachidonic acid 20:4n-6.Variability of the fatty acid components were studied in four seasons. Maximum percentage level in Saccostrea cucullata for 14:0, 4, 8, 12 tri Me 13:0, 16:0 and 15:0 as saturated fatty acids was observed in summer, while for 18:1n-9, 20:1n-11 and 20:5n-3 (as unsaturated fatty acids) maximum concentration was observed in winter. The environmental factors were monitored monthly and their effects on seasonal variations of the fatty acids were studied by applying pearson coefficient correlation. The results showed the significant dependency of 20:1n-11 fatty acid concentration to ambient temperature and 9,12 18:2 fatty acid to silicate as environmental factors. Also, principal component analysis was done to establish the fatty acid groups. After Varimax rotation, three factors were extracted, of which first and second factors contributed to 86% of the data matrix. These were mainly dependent on the seasonal variations of the fatty acids.

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