1Department of Food Science and Technology, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477, 2Department of Food Science and Nutrition, Kyoritsu Women's University, Chiyoda, Tokyo 101-8433, Japan
The lipid content and fatty acid composition of abdominal muscle, dorsal muscle, dark muscle, skin, ventricle, atrium, artery ball, liver, intestine, pyloric caucus, and orbit in the skipjack tuna, Katsuwonus pelamis, were investigated based on the comparison of lipids between “Nobori-Katsuo”, skipjack tuna migration northward along the Pacific coast of Japan in spring, and “Kudari-Katsuo”, skipjack tuna migration southward along the Pacific coast of Japan in autumn.
The amount of triglyceride in the dorsal muscle, dark muscle, atrium, pyloric caucus and intestine was fairly higher in “Kudari-Katsuo” compared with that of “Nobori-Katsuo”. The fact suggests that the triglyceride in these parts of “Nobori-Katsuo” was preferentially used for the energy of migration compared to the other parts.
Conversely, the amount of triglyceride and fatty acid composition in the orbit were almost the same between “Nobori-Katsuo” and “Kudari-Katsuo”. The relative amount of docosahexaenoic acid (DHA) was lower in almost all parts of “Kudari-Katsuo”.