Lipid characteristics of coastal migratory Sarda orientalis tissues |
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Authors: | Kazufumi Osako Hiroaki Saito Wuyin Weng Koichi Kuwahara and Munehiko Tanaka |
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Institution: | (1) Department of Food Science and Technology, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan;(2) National Research Institute of Fisheries Science, Fisheries Research Agency, Yokohama 236-8648, Japan;(3) Nagasaki Prefectural Institute of Fisheries, Taira-machi, Nagasaki 851-2213, Japan |
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Abstract: | To characterize the 22:6 n-3 (docosahexaenoic acid, DHA) levels of the oriental bonito Sarda orientalis, a coastal migratory tuna species, total lipids (TL) of white muscle, dark muscle, liver, pyloric cecum, gonad, and other
viscera were separated into lipid classes, the constituents of TL were quantified, and the fatty acid composition of TL, triacylglycerols
(TAG), phosphatidylethanolamine, and phosphatidylcholine was analyzed. The crude lipid contents of muscle and other organs
were 0.8–3.2% and 2.3–9.1%, respectively. DHA was found in TL of various organs at levels ranging from 19.2% to 27.6% in muscle
and 16.3% to 28.5% in other organs. The levels of DHA in muscle TAG (8.2–16.0%) were lower than or comparable to those in
visceral TAG (6.9–24.0%). These findings did not coincide with those observed in active-migratory tuna species, which accumulate
DHA in their muscle TAG during migration. These findings suggest that the DHA distribution of S. orientalis is different from that observed in active-migratory tuna species, and that the differences may be due to migration type of
the fish. |
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Keywords: | Bioaccumulation Chemoecology Coastal migratory fish Docosahexaenoic acid n-3 Polyunsaturated fatty acid Sarda orientalis |
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