Abstract
Introduction
Metabolomics applications to the aquaculture research are increasing steadily. The use of standardized proton nuclear magnetic resonance (1H NMR) spectroscopy can provide the aquaculture industry with an unbiased, reproducible, and high-throughput screening tool, which can help to diagnose nutritional and disease-related metabolic disorders in farmed fish.
Objective
Standard operating procedures developed for analysing (human) plasma by 1H NMR were applied to fingerprint the metabolome in plasma samples collected from Atlantic salmon. The aim was to explore the metabolome of salmon plasma in relation to growth stage and sampling site.
Methods
A total of 72 salmon were collected from three aquaculture sites in Norway (Lat. 65, 67, and 70 °N) and over two sampling events (December 2017 and November 2018). Plasma drawn from each salmon was measured by 1H NMR and metabolites were quantified using the SigMa software. The NMR data was analysed by principal component analysis (PCA) and ANOVA-simultaneous component analysis (ASCA).
Results
Important metabolic differences were evidenced, with adult salmon having a much higher content of very low-density lipoproteins and cholesterol in their plasma, while smolts displayed significantly higher levels of propylene glycol. Overall, 24% of the metabolite variation was due to the growth stage, whereas 12% of the metabolite variation was related to the aquaculture site and practice (p < 0.001).
Conclusion
This study provides a baseline investigation of the plasma metabolome of the Atlantic salmon and demonstrates how 1H NMR metabolomics can be used in future investigations for comparing aquaculture practices and their influence on the fish metabolome.
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Financial support provided by The Norwegian Seafood Research Foundation, FHF Project no. 901435—GutMatters). The authors wish to acknowledge the Danish Innovation Foundation for the generous support to the project entitled “COUNTERSTRIKE – Counteracting Sarcopenia with proteins and exercise – screening the CALM cohort for lipoprotein biomarkers” (IFD: 4105-00015B).
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VA, SBE, ÅK and PM conceived and designed research. VA, TMK and EMC conducted experiments. VA, BK and KMS analysed data. VA drafted the manuscript. All authors read, commented, and approved the manuscript.
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Aru, V., Khakimov, B., Sørensen, K.M. et al. The plasma metabolome of Atlantic salmon as studied by 1H NMR spectroscopy using standard operating procedures: effect of aquaculture location and growth stage. Metabolomics 17, 50 (2021). https://doi.org/10.1007/s11306-021-01797-0
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DOI: https://doi.org/10.1007/s11306-021-01797-0