Effects of dietary fish to rapeseed oil ratio on steatosis symptoms in Atlantic salmon (Salmo salar L) of different sizes
Publication details
Journal : Scientific Reports , vol. 14 , p. 1–18–0 , 2024
Publisher : Nature Portfolio
International Standard Numbers
:
Printed
:
2045-2322
Electronic
:
2045-2322
Publication type : Academic article
Issue : 1
Links
:
ARKIV
:
hdl.handle.net/11250/3147275
DOI
:
doi.org/10.1038/s41598-024-684...
Research areas
Feed development and nutrition
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Summary
Choline is recognized as an essential nutrient for Atlantic salmon at all developmental stages. However, its dietary requirement is not well defined. Choline plays a critical role in lipid transport, and the clearest deficiency sign is intestinal steatosis. The present work, aiming to find whether lipid source and fish size may affect steatosis symptoms, was one of a series of studies conducted to identify which production-related conditions may influence choline requirement. Six choline-deficient diets were formulated varying in ratios of rapeseed oil to fish oil and fed to Atlantic salmon of 1.5 and 4.5 kg. After eight weeks, somatic characteristics were observed, and the severity of intestinal steatosis was assessed by histological, biochemical, and molecular analyses. Fatty acid composition in pyloric intestine, mesenteric tissue, and liver samples was also quantified. The increasing rapeseed oil level increased lipid digestibility markedly, enhancing lipid supply to the fish. Moreover, small fish consume
