Lipids in atlantic halibut (Hippoglossus hippoglossus) eggs from planktonic samples in Northern Norway |
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Authors: | S Falk-Petersen J R Sargent C Fox I -B Falk-Petersen T Haug E Kjørsvik |
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Institution: | (1) Akvaplan a/s, Søndre Tollbugt. 3, N-9000 Tromsø, Norway;(2) NERC Unit of Aquatic Biochemistry, School of Molecular and Biological Sciences, University of Stirling, FK9 4LA Stirling, Scotland;(3) Norwegian College of Fishery Science, University of Tromsø, P.O. Box 3083, N-9001 Tromsø, Norway;(4) Department of Marine Biology, Tromsø Museum, University of Tromsø, P.O. Box 2550, N-9001 Tromsø, Norway |
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Abstract: | Fertilized Atlantic halibut (Hippoglossus hippoglossus L.) eggs in different developmental stages (Days 0 to 18) were sampled from plankton in North Norway in February 1986 and analysed for lipid classes and fatty acid content. In unfertilized ovulated eggs taken from ripe fish caught in 1983/1984, polar and neutral lipids comprised ca. 71 and 30% of the total lipids, respectively, decreasing and increasing to 67 and 33%, respectively, in Stage III (11 to 18 d old) fertilized eggs. Of the polar lipids, phosphatidylcholine decreased markedly from 62% in unfertilized ovulated eggs to ca. 40% in Stage I (0 to 3 d old) fertilized eggs, while phosphatidylethanolamine increased from ca. 7 to 33%. Triacylglycerols, the major neutral lipids, increased from ca. 13% in unfertilized ovulated eggs to 16% in Stage III fertilized eggs. The total lipid in Stage I fertilized eggs had relatively low levels of polyunsaturated fatty acids (PUFA), with (n-3) PUFA accounting for only ca. 25% of the total fatty acids. The (n-3) PUFA increased to ca. 40% of the total fatty acids in Stage III, while the (n-3): (n-6) ratio increased from 4.1 to 7.0. |
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