64 MARCH 2014 • WORLD AQUACULTURE • WWW.WAS.ORG Table 4 presents the n-3 PUFA content in relation to total lipids, fat content, and the n-3 values in control and experimental fillets. Fillet samples derived from fish fed the control diet had somewhat higher n-3 content. Among the n-3 fatty acids, the most important are eicosapentaenoic acid (EPA) and docosahexaenoic (DHA) acid. The proportion of these two essential fatty acids in the samples are shown in Figure 4. Sturgeon hybrid fillets derived from contol and experimental fishes demonstrated opposite results in EPA and DHA contents. That can be explained by the increased linoleic acid intake from the linseed oil supplemented diet. However, the total n-3 contents of both group are favorable from a nutritional point of view. According to the Regulation (EC) No. 1924/2006 of the European Parlament and of the European Council, whose laws determine the standards of labelling, the experimental fish fillets could qualify as a source of omega-3 fatty acids because they contain at least 0.3 g alpha-linolenic acid per 100 g or at least 40 mg of the sum of EPA and DHA per 100 g of product. The Food and Nutrition Board, Institute of Medicine (2005) recommends an n-3 fatty acid intake for men of 1.6 g/day and for women of 1.1 g/day. Knowing the n-3 content of fillets, the suggested quantity of sturgeon hybrids that should be consumed by humans is 105 g/day for men and 72 g/day for women. Linseed oil supplement of diets improves the fatty acid composition of fillets of sturgeon reared under intensive conditions. The control diet resulted in a greater n-3 content of fillets of sturgeon hybrids. Notes Jenő Káldy (corresponding author), West Hungarian University, Faculty of Agricultural and Food Sciences, H-9200, Mosonmagyaróvár, Vár 2. kaldyjeno@gmail.com, Tel.: +36 30/507-2221 Fax.: +36 96/566695. Ákos Szilágyi, Neptun Fishery Manufacturer and Supplier Co. H-2451, Ercsi, Panoráma u. 10. kozepdunaihal@invitel.hu Tel/Fax.: +36 30/939-0910 Fax:+36 25/520-520. Gábor Szilágyi, Győri ELŐRE Fisheries Cooperative, H-9062, Kisbajcs, Arany János u. 22. Pf.: 3 bajcshal@bajcshal.hu Tel.: +36 96/560-220. László Szathmári, West Hungarian University, Faculty of Agricultural and Food Sciences, H-9200, Mosonmagyaróvár, Vár 2. szathmaril@mtk.nyme.hu Tel.: +36 96/566-713 Fax: +36 96/566-695. References Food and Nutrition Board. 2005. Institute of Medicine of the National Academies, Budapest, Hungary. Husvéth, F., H. A. Manilla, G. Kovács and K. Németh. 1999. The operate possibilities of poultry-product fatty-acid content towards healty food-supply. Állattenyésztés és Takarmányozás 48:805-808. Jump, D.B. 2002. The biochemistry of n-3 polyunsaturated fatty acids. Journal of Biological Chemistry 277:8755-8758. Murray, J. and J. R. Burt. 2001. The composition of fish FAO Torry advisory note 38. Online at www.fao.org/wairdocs/tan/x5916e/ x5916e00.htm. Nürnberg, K., J. Wegner and K. Ender. 1998. Factors influencing fat composition in muscle and adiposetissue of farm animals. Livestock Production Science 56(2):145-156. Okuyama, H., T. Kobayashi and S. Watanabe. 1996. Dietary fatty acids – The n-6/n-3 balance and chronic elderly diseases. Excess linoleic acid and relative n-3 deficiency syndrome seen in Japan. Progress in Lipid Research 35(4): 409-457. Simopoulos, A. P. 2001. N-3 fatty acids and human health: defining strategies for public policy. Lipids 36(1):83-89. Sugano, M. 1996. Characteristics of fats in Japanese diets and current recommendations. Lipids 31(1):283-286. Szathmári, L., J. Káldy, Á. Németh, G. Szilágyi and Cs. Hancz. 2009. Fish consumption habits and trends of fish commerce in Hungary. Táplálkozás és Marketing 2009 1(2):81-85. FIGURE 3. Ratio of n-6/n-3 fatty acids in samples of fillets of sturgeon hybrids fed diets with or without linseed oil supplementation. FIGURE 4. EPA and DHA content in samples of fillets of sturgeon hybrids fed diets with or without linseed oil supplementation.
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