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The high content of monoene fatty acids in the lipids of some midwater fishes: Family myctophidae

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Lipids

Abstract

The total lipids of eleven species of Myctophids caught at depths between 20 and 700 m in the northern Pacific Ocean were analyzed using silicic acid column chromatography (lipid classes) and capillary gas chromatography (fatty acid and fatty alcohol composition). The major components in the lipid classes were triacylglycerols or wax esters; triacylglycerols were the dominant acyl neutral lipids (68.1–96.1%) in eight species, and wax esters were found as the dominant lipid (85.5–87.9%) in three species. The major fatty acids and alcohols contained in the was esters of the three fishes were 18:1n–9, 20:1n–9, 20:1n–11, and 22:1n–11 for fatty acids, and 16:0, 18:1, 20:1, and 22:1 for fatty alcohols. Fatty acids in the triacylglycerols ranging from C14 to C22 were predominantly of even chain length. The major components were 16:0, 16:1n–7, 18:1n–9, 20:1n–11, 22:1n–11, 20:5n–3 (icosapentaenoic acid), and 22:6n–3 (docosahexaenoic acid). In both the triacylglycerols and the wax esters, the major fatty components were monoenoic acids and alcohols. It is suggested from the lipid chemistry of the Myctophids that they may prey on the same organisms as the certain pelagic fishes such as saury and herring, because the large quantities of monoenoic fatty acids are similar to those of saury, herring, and sprats whose lipids originate from their prey organisms such as zooplanktons which are rich in monoenoic wax esters.

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Abbreviations

DHA:

docosahexaenoic acid

EPA:

icosapentaenoic acid

FAME:

fatty acid methyl ester

GLC:

gas-liquid chromatography

NMR:

nuclear magnetic resonance

PUFA:

polyunsaturated fatty acids

RRT:

relative retention time

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Saito, H., Murata, M. The high content of monoene fatty acids in the lipids of some midwater fishes: Family myctophidae. Lipids 31, 757–763 (1996). https://doi.org/10.1007/BF02522892

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