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. 2023 Feb;49(1):39-60.
doi: 10.1007/s10695-022-01157-2. Epub 2022 Dec 16.

Atlantic salmon adapt to low dietary n-3 PUFA and warmer water temperatures by increasing feed intake and expression of n-3 biosynthesis-related transcripts

Stefanie M Colombo  1 , Suzanne M Budge  2 , Jennifer R Hall  3 , Jovana Kornicer  2 , Nolan White  4
Affiliations

Atlantic salmon adapt to low dietary n-3 PUFA and warmer water temperatures by increasing feed intake and expression of n-3 biosynthesis-related transcripts

Stefanie M Colombo et al. Fish Physiol Biochem. 2023 Feb.

Abstract

Climate change can have cascading impacts on biochemical reactions in aquatic ecosystems. Aquatic ectotherms can adapt to surrounding temperatures by using long-chain polyunsaturated fatty acids (LC-PUFAs) to maintain cell membrane fluidity. In a warming scenario, less LC-PUFA is needed to maintain fluidity. Our objective was to determine the impact of low dietary LC-PUFA and warm water temperature on growth, fatty acid (FA) storage, and expression of lipid metabolism-related transcripts in Atlantic salmon. Salmon (141 g) were fed two diets (high or low LC-PUFA) at either 12 °C or 16 °C for 16 weeks. Salmon weighed more and consumed more food at 16 °C and when fed the low-LC-PUFA diet. Liver and muscle FA mostly depended on diet rather than temperature. DHA in muscle was higher at 16 °C and in salmon fed the high-LC-PUFA diet. Levels of FA desaturation transcripts were more highly expressed at 16 °C and in salmon fed the low-LC-PUFA diet, which suggests synthesis of LC-PUFA. Overall, with slow, chronic temperature increases, salmon may adapt to low dietary LC-PUFA by synthesizing more when required.

Keywords: Aquaculture; Climate change; Global warming; Omega-3 fatty acids; Wild salmon.

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