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Seasonal dynamics of fatty acid composition in female northern pike (Esox lucius L.)

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Abstract

Seasonal changes in the fatty acid composition of neutral and polar lipids were measured in the ovary, liver, white muscle, and adipopancreatic tissue of northern pike. The role of environmental and physiological factors underlying these changes was evaluated. From late summer (August–September) to winter (January–March), the weight percentage of n-3 polyunsaturated fatty acids (especially 22:6n3) declined significantly in the neutral lipids of all somatic tissues examined. However, large quantities of n-3 polyunsaturated fatty acids accumulated in the recrude cing ovaries during fall and the weight percentage of n-3 polyunsaturated fatty acids in ovary polar lipids also increased significantly. Additionally, the n-3 polyunsaturated fatty acid content of somatic polar lipids increased significantly during fall due to increases in the total polar lipid content of the somatic tissues. This suggests that during fall n-3 polyunsaturated fatty acid are diverted away from somatic neutral lipids and thereby conserved for use in ovary construction and for incorporation into tissue polar lipids. The percentage of n-3 polyunsaturated fatty acid in ovary neutral lipids also declined during fall and early winter, perhaps as an adaptation to conserve these fatty acids for storage in oocyte polar lipids and later incorporation into cellular membranes of the developing embryo. Reductions in the n-3 polyunsaturated fatty acids content of somatic and ovarian neutral lipids during fall were compensated for specifically by increases in the percentage of monounsaturated fatty acids rather than saturated fatty acids. This suggests that the ratio of saturated to unsaturated fatty acids in pike neutral lipid, is regulated physiologically, and hence may influence the physiological functioning of these lipids. During fall and early winter the percentage of saturated fatty acids declined significantly in the polar lipids of all tissues examined. This change was consistent with the known effects of cold acclimation on the fatty acid composition of cellular membranes. As the ovaries were recrudescing from September to January, liver polar lipids exhibited significant decreases in the percentage of total polyunsaturated fatty acids and n-3 polyunsaturated fatty acids and increases in monounsaturated fatty acids, and acquired a fatty acid composition very similar to that of ovary polar lipids. Therefore, seasonal changes in the percentage of polyunsaturated and monounsaturated fatty acids in liver polar lipids probably reflect the liver's role in vitellogenesis rather than the effects of temperature on membrane fatty acid composition. At all times of year, the fatty acid compositions of white muscle and adipopancreatic tissue neutral lipids were very similar, which may indicate a close metabolic relationship between these lipid compartments.

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Abbreviations

AP:

adipopancreatic

BHT:

butylated hydroxytoluene

CI:

confidence interval

EFA:

essential fatty acids

MUFA:

monounsaturated fatty acids

NL:

neutral lipids

PL:

polar lipids

PUFA:

polyunsaturated fatty acids

SFA:

saturated fatty acids

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Authors and Affiliations

  1. Department of Zoology, University of Alberta, T6G 2E9, Edmonton, Alberta, Canada

    K. Schwalme & W. C. Mackay

  2. Nutrition and Metabolism Research Group, University of Alberta, 533 Newton Research Building, T6G 2C2, Edmonton, Alberta, Canada

    M. T. Clandinin

Authors
  1. K. Schwalme
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  2. W. C. Mackay
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  3. M. T. Clandinin
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Schwalme, K., Mackay, W.C. & Clandinin, M.T. Seasonal dynamics of fatty acid composition in female northern pike (Esox lucius L.). J Comp Physiol B 163, 277–287 (1993). https://doi.org/10.1007/BF00347778

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  • DOI: https://doi.org/10.1007/BF00347778

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