Abstract
Little is known about the changes in composition of brain lipids and fatty acids at different stages of development in fish. Wild Atlantic herring (Clupea harengus L.) were collected from Loch Linnhe and the Firth of Clyde, Scotland, from August 1990 to March 1991. Lipid class and fatty acid compositions of brain lipids were studied at four different stages of development: larvae at the end of the yolk sac stage, two juvenile stages and sexually mature adults. The total lipid content in brains increased during development, and larval brains contained higher proportions of neutral lipids and lower proportions of polar lipids than the brains of juvenile or adult herring. Increased proportions of polar lipids in juvenile and adult herring brains were mainly due to increased percentages of phosphatidylcholine (PC), phosphatidylethanolamine (PE), cerebrosides and sulphatides. The increase in the proportions of the glycolipid classes suggested increasing levels of myelination with development. In total lipids, saturated fatty acids generally decreased and monounsaturated fatty acids and dimethyl acetals (derived from PE-plasmalogen) increased from larvae to adults. However, the proportions of polyunsaturated fatty acids in individual phosphoglycerides were generally highest in juvenile stages, due mainly to increased 22:6n-3, and were lowest in adult fish. Relatively high percentages of 24:1 isomers were found in all the phosphoglycerides, but primarily PC, and these increased during development from larvae to adult. Fatty acids were distributed between individual phosphoglycerides with a characteristic pattern that did not change with development, although the relative amounts of individual fatty acids were altered. The variations and roles of the different lipid components of herring brain are discussed with respect to lipid compositions and functions in brains of other fishes and vertebrates.
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Communicated by J. Mauchline, Oban
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Mourente, G., Tocher, D.R. Lipid class and fatty acid composition of brain lipids from Atlantic herring (Clupea harengus) at different stages of development. Marine Biology 112, 553–558 (1992). https://doi.org/10.1007/BF00346172
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DOI: https://doi.org/10.1007/BF00346172