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Natural abundance of N-15 and C-13 in fish tissues and the use of stable isotopes as dietary protein tracers in rainbow trout and gilthead sea bream

Abstract : For developing efficient diets, two sets of experiments examined whether the use and allocation of dietary protein can be traced by labelling with stable isotopes (N-15 and C-13) in two culture fish (Oncorhynchus mykiss and Sparus aurata). In the first experiment, natural abundance and tissue distribution of these isotopes were determined, by measuring the delta C-13 and delta N-15 values by isotopic ratio mass spectrometry, in fingerlings (14-17 g) adapted to diets differing in the percentage of fish meal replacement by plant protein sources. For both species, delta N-15 and delta C-13 were greater in tissues with higher protein and lower lipid content. Delta N-15 of diets and tissues decreased as replacement increased, suggesting delta N-15 can be used as a marker for dietary protein origin. The N-15 fractionation (delta N-15 fish - delta N-15 diet) differed between groups, and could thus be used to indicate protein catabolism. In the second experiment, fish (75-90 g) of each species ingested a diet enriched with N-15-protein (10 g kg(-1) diet) and C-13-protein (30 g kg(-1) diet). These proportions were suitable for determining that the delta values of tissue components were high enough above natural levels to allow protein allocation to be traced at 11 and 24 h after feeding, and revealed clear metabolic differences between species.
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Submitted on : Saturday, May 30, 2020 - 11:10:21 AM
Last modification on : Thursday, September 9, 2021 - 9:38:05 AM

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M. Beltran, J. Fernandez-Borras, Françoise Médale, J. Perez-Sanchez, Sadasivam Kaushik, et al.. Natural abundance of N-15 and C-13 in fish tissues and the use of stable isotopes as dietary protein tracers in rainbow trout and gilthead sea bream. Aquaculture Nutrition, Wiley, 2009, 15 (1), pp.9-18. ⟨10.1111/j.1365-2095.2008.00563.x⟩. ⟨hal-02657826⟩

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