Food, Global Health 2 min

Prediction of fatty acid composition in rainbow trout at low cost

This study involved the calibration of Raman microspectroscopy to assess the fatty acid composition of adipose tissue in rainbow trout. The method was found to be reliable for omega 3 fatty acids (EPA and DHA).

Published on 27 April 2022

illustration Prediction of fatty acid composition in rainbow trout at low cost
© E. Prado

The importance of poly-unsaturated fatty acids (PUFAs) in food is crucial for the animal and human development and health. As a complementary strategy to nutrition approaches, genetic selection has been suggested to improve fatty acid (FAs) composition in farmed fish. Gas chromatography (GC) is used as a reference method for the quantification of FAs; nevertheless, the high cost prevents large scale phenotyping as needed in breeding programs.
Therefore, a calibration by means of Raman scattering spectrometry has been established in order to predict FA composition of visceral adipose tissue in rainbow trout Onchorhynchus mykiss. FA composition was analyzed by both GC and Raman micro-spectrometry techniques on 268 individuals fed with three different feeds, which have different FA compositions. Among the possible regression methods, the ridge regression method, was found to be efficient to establish calibration models from the GC and spectral data.
The best cross-validated R2 values were obtained for total PUFAs, omega-6 (Ω-6) and omega-3 (Ω-3) PUFA (0.79, 0.83 and 0.66, respectively). For individual Ω-3 PUFAs, α-linolenic acid (ALA, C18:3), eicosapentaenoic acid (EPA, C20:5) and docosahexenoic acid (DHA, C22:6) were found to have the best R2 values (0.82, 0.76 and 0.81, respectively).

This study demonstrates that Raman spectroscopy could be used to predict PUFAs with good correlation coefficients on adipocytes, for future on adipocyte physiology or for large scale and high throughput phenotyping in rainbow trout.



sylvie André

scientific contacts

Jérôme Bugeon Fish Physiology and Genomics Joint Research Unit (LPGP)

Geneviève Corraze Nutrition, Metabolism, Aquaculture Joint Research Unit (NuMeA)


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