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Research article2022Peer reviewedOpen access

Oleaginous yeast Rhodotorula toruloides biomass effect on the metabolism of Arctic char (Salvelinus alpinus)

Brunel, Mathilde; Burkina, Viktoriia; Pickova, Jana; Sampels, Sabine; Moazzami, Ali A.

Abstract

Sustainability issues arise when using fish oil and vegetable oils in fish feed production for aquaculture purposes. Microbial production of single cell oil is a potential alternative as a lipid ingredient in the production of fish feed. In this study, we replaced the vegetable oils with the oleaginous yeast R. toruloides biomass in the diet of Arctic char (S. alpinus) and investigated the effects on health and composition. Measurement of fish growth parameters showed a higher liver weight and hepatosomatic index in the experimental group of fish fed partly with yeast biomass compared to a control group fed a diet with vegetable oils. No significant differences in the lipid content of muscle and liver tissues were found. The fatty acid profiles in the muscle of both fish groups were similar while the experimental fish group had a higher amount of monounsaturated fatty acids in the liver. Histology of livers showed no significant difference in the number of lipid droplets. The size of hepatic lipid droplets seemed to be related to liver fat content. Quantification of metabolites in the liver revealed no differences between the fish groups while plasma metabolites involved in energy pathways such as alanine, 3-hydroxybutyrate, creatinine, serine, betaine, and choline were significantly higher in the experimental fish group.

Keywords

metabolomics; fish feed replacement; fatty acids; metabolites; gluconeogenesis; plasma; liver; oleaginous yeast

Published in

Frontiers in Molecular Biosciences
2022, Volume: 9, article number: 931946
Publisher: FRONTIERS MEDIA SA

      SLU Authors

            • Sustainable Development Goals

            Conserve and sustainably use the oceans, seas and marine resources for sustainable development

            UKÄ Subject classification

            Fish and Aquacultural Science

            More information

            Correction in: Frontiers in Molecular Biosciences, 2022, Volume: 9, article number: 1101980, DOI: 10.3389/fmolb.2022.1101980

            Publication identifier

            DOI: https://doi.org/10.3389/fmolb.2022.931946

            Permanent link to this page (URI)

            https://res.slu.se/id/publ/118936