The high content of monoene fatty acids in the lipids of some midwater fishes: Family myctophidae |
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Authors: | Hiroaki Saito Masakazu Murata |
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Affiliation: | (1) National Research Institute of Fisheries Science, Ministry of Agriculture, Forestry and Fisheries, 2-12-4, Fuku-ura, Kanazawa-ku, 236 Yokohama-shi, Japan |
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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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