降海時期における河川残留型および降海型サクラマス幼魚の脂質組成の相異 (サクラマスの脂質-2,3-)

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Differences in the lipid compositions and the fatty acid compositions of the residual type and seaward migration type of Masu salmon parr (Oncorhynchus masou) flesh lipids during the period of seaward migration were investigated.The results obtained are summarized as follows:1) The lipid content of the seaward migration type was less than one-half that of the residual type.2) Comparison of the residual type and seaward migration type lipid compositions indicated a lower content of triglycerides and higher contents of phospholipids and free sterols in the seaward migration type.3) The contents of each fatty acid were uniformly lower in the seaward migration type than in the residual type, the decrease in palmitoleic and oleic acids being more conspicuous in the seaward migration type.It was considered that the consumption of lipids (mainly triglycerides) as the energy source in the seaward migration type swelled during the period of seaward migration and that, among the fatty acids, the monoenoic acids might be chiefly consumed. Furthermore, the consumption of polyenoic acids as well as saturated and monoenoic acids might increase during the latter stage of smolt-transformation.
日本水産學會の論文