TY - JOUR
T1 - Variation of lipids and fatty acids of the japanese freshwater eel, anguilla japonica, during spawning migration
AU - Saito, Hiroaki
AU - Kurogi, Hiroaki
AU - Chow, Seinen
AU - Mochioka, Noritaka
N1 - Publisher Copyright:
© 2015 by Japan Oil Chemists’ Society.
PY - 2015/4/20
Y1 - 2015/4/20
N2 - The lipid and fatty acid composition of the muscle of the wild Japanese freshwater eel, Anguilla japonica, was analyzed between the initial and terminal stages of spawning migration to clarify the relationship between lipid physiology and maturation. Triacylglycerols were the only major component in the initial-phase eels, which contained high levels of lipids, while comparatively low triacylglycerol levels were observed in terminal-phase eels (Mariana silvers) at spawning area. Significant levels of plasmalogens were found in its phosphatidylethanolamine, different from other common fish species, which have their little levels. The major fatty acids in A. japonica depot triacylglycerols were 14:0, 16:0, 18:0, 16:1n-7, 18:1n- 7, 18:1n-9, and 18:2n-6. Noticeable levels of 20:4n-6, EPA, 22:5n-3, and DHA were also found in initialphase sample TAG at the yellow and initial silver stages. High 18:2n-6 levels in all A. japonica lipids were similar to those in other common freshwater fishes. In all A. japonica tissue phospholipids, high levels of n-6 and n-3 PUFA, such as 20:4n-6, EPA, 22:5n-3, and DHA, were observed except for the matured terminal female sample. High n-6 PUFA levels in terminal-phase samples caught at the spawning area suggest that A. japonica maintains and uses initial fatty acids from inland waters without feeding during long spawning migrations. The post-spawning sample, containing low levels of 20:4n-6 and DHA with unusually high levels of its degradation products (18:3n-6, 20:2n-6, and 18:4n-3), indicates that A. japonica may finally use its most important PUFA as energy for spawning before ending its life.
AB - The lipid and fatty acid composition of the muscle of the wild Japanese freshwater eel, Anguilla japonica, was analyzed between the initial and terminal stages of spawning migration to clarify the relationship between lipid physiology and maturation. Triacylglycerols were the only major component in the initial-phase eels, which contained high levels of lipids, while comparatively low triacylglycerol levels were observed in terminal-phase eels (Mariana silvers) at spawning area. Significant levels of plasmalogens were found in its phosphatidylethanolamine, different from other common fish species, which have their little levels. The major fatty acids in A. japonica depot triacylglycerols were 14:0, 16:0, 18:0, 16:1n-7, 18:1n- 7, 18:1n-9, and 18:2n-6. Noticeable levels of 20:4n-6, EPA, 22:5n-3, and DHA were also found in initialphase sample TAG at the yellow and initial silver stages. High 18:2n-6 levels in all A. japonica lipids were similar to those in other common freshwater fishes. In all A. japonica tissue phospholipids, high levels of n-6 and n-3 PUFA, such as 20:4n-6, EPA, 22:5n-3, and DHA, were observed except for the matured terminal female sample. High n-6 PUFA levels in terminal-phase samples caught at the spawning area suggest that A. japonica maintains and uses initial fatty acids from inland waters without feeding during long spawning migrations. The post-spawning sample, containing low levels of 20:4n-6 and DHA with unusually high levels of its degradation products (18:3n-6, 20:2n-6, and 18:4n-3), indicates that A. japonica may finally use its most important PUFA as energy for spawning before ending its life.
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U2 - 10.5650/jos.ess14293
DO - 10.5650/jos.ess14293
M3 - Article
C2 - 26028326
AN - SCOPUS:84930251256
VL - 64
SP - 603
EP - 616
JO - Journal of Oleo Science
JF - Journal of Oleo Science
SN - 1345-8957
IS - 6
ER -