Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8953
Title: Uptake and selective partitioning of dietary lipids and fatty acids to ovarian and muscle tissue of maturing coho salmon during secondary oocyte growth
Author: Ronald B. Johnson, Eric L. Kroeger, W. L. Reichert, Cameron S. Carter, M. B. Rust
Publication Year: 2017
Journal: Comparative Biochemistry and Physiology Part B: Comparative Biochemistry
Volume: 208-209
Pages: 7-18
Keywords: coho salmon,lipids,fatty acids,stable isotopes

Female coho salmon, Oncorhynchus kisutch, were fed one of two experimental feeds containing lipids with markedly different stable 13C isotope signatures during the late cortical alveolus, lipid droplet, and vitellogenesis stages of secondary oocyte growth.  Ovarian and muscle lipids fatty acid concentrations were significantly affected by treatment during all three stages of development.  Stable 13C isotope analyses confirmed that dietary lipids were incorporated into both ovarian and muscle lipids during all three stages and revealed that ovarian lipids were more affected than muscle lipids during vitellogenesis.  Arachidonic acid (ARA) was incorporated into ovarian lipids at the highest rate of all fatty acids examined with the greatest uptake observed during the cortical alveolus and lipid droplet stages of development.  Docosahexaenoic acid (DHA) was incorporated into ovarian lipids at the next highest rate with the greatest uptake observed during the lipid droplet stage of development.  The presence of an ovary specific, fatty acid transfer mechanism is proposed.  Results from this study demonstrate the ability to greatly alter the fatty acid composition of ovarian lipids through a dietary change during secondary oocyte growth and may be of great interest to producers of farmed salmon and salmon broodstock programs.

Theme: Sustainable, safe and secure seafood for healthy populations and vibrant communities
Foci: Develop research and technology to foster innovative and sustainable approaches to aquaculture.