Slices of Scomberomorous guttatus cooked by four different methods (microwave cooking, grilling, steaming and shallow fat frying) were kept chilled at 5 C for 2 days, reheated by microwave and then evaluated for the changes in the lipid characteristics. The total lipid content for raw sample was 6.0 g/100 g which consist of 49.4 g/100 g saturated (SFA), 6.9 g/100 g monounsaturated (MUFA) and 43.8 g/100 g polyunsaturated fatty acids (PUFA). Upon cooking, the total lipids changed to about 7 (microwave), 11 (grilling), 5 (steaming) and 10 g/100 g (shallow fat frying). These changes are significant, with the exception of steam cooking. Cooking did not significantly affect the percentage of NPL, PL, SFA, MUFA and PUFA in the samples. Frying resulted in the change of the SFA/PUFA ratio more than other cooking methods. A significant (P < 0.05) decrease in the content of EPA was only found in the fried samples. A significant (P < 0.05) decrease in the content of DHA in all cooked samples were also obtained. The n-6/n-3 ratio did not change significantly in all cooked and reheated samples, except for shallow fat fried. Reheating did not significantly affect the NPL and PL contents of the fillets, except for microwave cooked samples. Cooking increases the FFA, PV and TBA of samples; reheating enhances the increase.

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Fatty acid distribution in the different parts of kutum, Rutilus frisii kutum and the effect of frying and refrigerated storage followed by reheating on lipid oxidation and fatty acid composition in different parts of body flesh were evaluated. Lipid content increased after frying and reheating. In general, saturated fatty acids were higher in anterior parts, while the contents of polyunsaturated fatty acids increased from the anterior to the posterior parts. Frying decreased the contents of unsaturated fatty acids but increased the contents of saturated fatty acids. After refrigerated storage, followed by microwave reheating, the content of polyunsaturated fatty acids decreased, whereas the content of saturated fatty acids increased. The peroxide value increased after frying, compared with that of raw sample. However, the lower PV was obtained in fried-chilled-reheated samples. Frying increased the TBA values and reheating enhanced this increment. Therefore, the frying as well as the refrigerated storage and reheating had the impact on fatty acid composition as well as oxidative stability of kutum fillets.

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