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The polyunsaturated v3-fatty acids, eicosapentaenoic acid and docosahexaenoic acid, have positive effects against to cardiovascular diseases. This work was carried out to investigate the fatty acid composition of the most popular fish from Turkey (mainly Istanbul area) and their nutritive values. Total lipid amounts and fatty acid compositions of 6 commonly consumed fish species were determined. Analyses of fatty acid methyl esters were performed by capillary gas chromatography. Palmitic acid (C16:0) and oleic acid (C18:1v9) were the predominant saturated and monoenoic fatty acids. The predominant polyunsaturated fatty acids were eicosapentaenoic acid (C20:5v3) and docosahexaenoic acid (C22:6v3). European anchovy and European pilchard are concluded to be good dietary sources of v3-polyunsaturated fatty acids, which are known to reduce the risk of cardiovascular diseases because of their high C20:5v3 and C22:6v3 content.

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Olive mill wastewater is a by-product of olive oil production and generates a major environmental problem in the Mediterranean area. The amount of oil and grease, which is one of the parameters used for the characterization of this wastewater, cannot be determined easily using a standard method. Therefore some modifications of the standard method were investigated in this study. To this end wastewater was first treated with lime, without using diatomaceous-silica, then acidified, filtered through muslin cloth only, and finally extracted with an organic solvent. However, the results obtained by the modified method didn't differ significantly from those obtained by the standard method. Furthermore some tests were conducted to recover the remaining oil, which may be economically important, in these waste products. The oil could be recovered in the range of 70.6 to 96.4% if the wastewater was treated with lime while air was passed through the mixture, filtered using a muslin cloth disk, dried, and extracted with an organic solvent.