Impact of dietary carbohydrate/protein ratio on hepatic metabolism in land-locked Atlantic salmon (Salmo salar L.)

• Published in: Frontiers in Physiology
• Main Authors: Betancor, Monica, Olsen, Rolk Erik, Marandel, Lucie, Skulstad, Ole F, Madaro, Angelico, Tocher, Douglas R, Panserat, Stephane
• Other Authors: Institute of Aquaculture, Norwegian University of Science And Technology (NTNU), French National Institute for Agricultural Research (INRA), Norwegian Institute of Marine Research, orcid:0000-0003-1626-7458, orcid:0000-0002-8603-9410
• Format: Article in Journal/Newspaper
• Language: English
• Published: Frontiers Media 2018
• Subjects: Salmon Populations; Dietary carbohydrate; transcriptomic; glucose metabolism; Land-locked; Atlantic salmon; Salmo salar
• Online Access: http://hdl.handle.net/1893/28335; https://doi.org/10.3389/fphys.2018.01751; http://dspace.stir.ac.uk/bitstream/1893/28335/1/fphys-09-01751.pdf

A common-garden experiment was carried out to compare two genetically distinct strains of Atlantic salmon (Salmo salar) fed diets with either high (CHO) or low (NoCHO) digestible carbohydrate (starch). Twenty salmon from either a commercial farmed strain (F) or a land-locked population (G) were placed in two tanks (10 fish of each population in each tank) and fed either CHO or NoCHO feeds. At the end of the experiment fish were fasted for 8 h, euthanized and blood and liver collected. Both diet and population had an effect on circulating glucose levels with G showing hypoglycaemia and dietary starch increasing this parameter. In contrast, G showed increased plasma triacylglycerol levels regardless of dietary treatment suggesting faster conversion of glucose to triacylglycerol. This different ability to metabolise dietary starch among strains was also reflected at a molecular (gene) level as most of the metabolic pathways evaluated were mainly affected by the factor population rather than by diet. The data are promising and suggest different regulatory capacities towards starch utilization between land-locked salmon and the farmed stock. Further analyses are necessary in order to fully characterise the capacity of land-locked salmon to utilise dietary carbohydrate.