Marine Biology

, Volume 143, Issue 2, pp 327–338

Effect of lipid emulsions on production and fatty acid composition of eggs of the scallop Argopecten purpuratus

  • N. Nevejan
  • V. Courtens
  • M. Hauva
  • G. Gajardo
  • P. Sorgeloos
Article
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Abstract

The impact of supplementing lipid emulsions rich in eicosapentaenoic acid (EmEPA), docosahexaenoic acid (EmDHA) or saturated fatty acids (EmCOCO) to a standard algal diet [3:1 mixture of Isochrysis galbana (T-iso) and Chaetoceros neogracile, St-diet] on Argopecten purpuratus broodstock was evaluated. Broodstock fecundity was compared as well as the egg quality in terms of lipid content, fatty acid composition and lipid class distribution. Fecundity was defined as the number of eggs released in the spawning process, since spawning was virtually complete. Results indicated that the total lipid content of the eggs of A. purpuratus was diet independent. A greater energy reserve was spent on a larger number of oocytes and not on bigger sized oocytes with a higher lipid content. The lipids supplied through the emulsions were at least partially allocated to the eggs, demonstrating that the fatty acid composition of the eggs could be manipulated, especially the neutral lipid fraction. Levels of EPA changed more rapidly than DHA levels, supporting the observation that they fulfilled an energetic and structural role, respectively. The St-diet supplemented with 50%EmCOCO resulted in a significantly higher fecundity compared to the algal diet supplemented with 25%EmEPA+25%EmDHA and the non-supplemented algal diet. It would seem that saturated fatty acids (SAFA) were more easily or preferentially incorporated in the female gonads of A. purpuratus. The relative content of SAFA and 18:2(n-6) in these eggs rose significantly. The relative content of the highly unsaturated fatty acids, EPA and DHA, on the other hand was substantially lower in the neutral lipid fraction, but hardly affected in the polar lipid fraction. It appeared that the maintenance of an adequate DHA/EPA ratio (approximately 1.2) was more important than the absolute levels of the two fatty acids, as long as a threshold value was reached.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • N. Nevejan
    • 1
    • 2
  • V. Courtens
    • 2
  • M. Hauva
    • 1
  • G. Gajardo
    • 1
  • P. Sorgeloos
    • 2
  1. 1.Universidad de Los LagosLaboratory of Genetics & AquacultureOsornoChile
  2. 2.Ghent UniversityLaboratory of Aquaculture & Artemia Reference CenterGhentBelgium

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