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Conference abstract, 2007

Sesamin addition to fish feed based on plant lipids alters the muscle fatty acid composition in rainbow trout

Trattner, Sofia; Kamal-Eldin, Afaf; Moazzami, Ali; Brännäs, Eva; Pickova, Jana

Abstract

The increasing demand for aquaculture production makes it necessary to find new land-based raw materials to replace the depleting fish sources in aquaculture fish feed. One drawback with land based raw materials is the decreased amount of n-3 LCPUFA in the fish. This makes it interesting to study effects of minor feed components and there effect on fatty acid composition in the fish. It has been shown that sesamin, one of the major lignans in sesame seed oil affects the FA metabolism in mammals (Jeng and Hou, 2005). The aim with this study was to investigate the effect of an equimixture of sesamin/episesamin supplementation in fish diets by using a two factorial design. The factors altered in the diet were the oil composition, being either a mixture of sunflower and linseed oil (40:60, w/w) (MO) or only linseed oil (LO) and the content of sesamin being 0 or 0.58 g / 100 g diet. The fish were fed ad libitum until their weight was doubled (30 days) at a water temperature of 10 ºC. Sesamin /episesamin addition to fish feed was shown to significantly affect the fatty acid (FA) composition of white muscle. Addition of sesamin/episesamin increased eicosapentaenoic acid, docosapentaenoic acid and especially docosahexaenoic acid (EPA, DPA and DHA) percentages in white muscle phospholipid and triacylglycerol (TAG). The proportion of 18:3n-3 in white muscle decreased (up to 26%) and DHA increased (up to 37%) as sesamin was supplemented (Fig. 1). Possibly sesamin increase the desaturation of 18:3n-3 towards its longer chain derivate. The FA in red muscle and liver were only slightly affected. Also, sesamin addition increased α-tocopherol levels in white muscle and liver. Reference: Jeng K.C.G., Hou R.C.W., 2005. Sesamin and sesamolin: Nature's Therapeutic Lignans. Current enzyme Inhibition. 1, 11-20

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Conference

Euro Fed Lipids