Magny Sidsel Thomassen

Towards the Digital Salmon: From a reactive to a pre-emptive research strategy in aquaculture (DigiSal)

Salmon farming in the future must navigate conflicting and shifting demands of sustainability, shifting feed prices, disease, and product quality. The industry needs to develop a flexible, integrated basis of knowledge for rapid response to new challenges. Project DigiSal will lay the foundations for a Digital Salmon: an ensemble of mathematical descriptions of salmon physiology, combining ...

Salmon farmed on modern feeds contains less of the healthy, long-chain fatty acids (EPA and DHA) than before. Up until the turn of the millennium, farmed salmon were fed fish oil as a replacement for their omega-3 rich natural prey. However, fish oil is now a scarce resource, and more than half of the fat in modern feeds comes from plant oils that are inexpensive, but devoid of long-chain omega-3 fatty acids. How can we increase the omega-3 content of salmon on sustainable feeds?

One option is ...

This is the fatty acid profile data from the freshwater portion of the feed switch trial. The last column has the sample ID eg: D0_MA-L-1/9_6 (Day 0, MA- Marine oil, L-liver, 1/9 sept 1, fish number 6

Fatty acid Systematic Name C14:0 Myristic acid myristin-syre C16:0 Palmitic acid palmitin-syre C16:1n7 Palmitoleic palmitolein-syre C17:0 C17:1 C18:0 stearic acid stearin-syre 18:1n9c oleic acid olje-syre C18:2n6c linoleic acid linolsyre C20:1 eicosenoic acid C18:3n3 linolenic acid linolensyre C20:2 ...

Fatty acid Systematic Name

C14:0 Myristic acid myristin-syre C16:0 Palmitic acid palmitin-syre C16:1n7 Palmitoleic palmitolein-syre C17:0 C17:1 C18:0 stearic acid stearin-syre 18:1n9c oleic acid olje-syre C18:2n6c linoleic acid linolsyre C20:1 eicosenoic acid C18:3n3 linolenic acid linolensyre C20:2 eicosadienoic C22:1 cetoleic acid cetolein-syre C20:3n3 eicosatrienoic acid C20:4n6 arachidonic acid arakidon-syre ARA C22:2 C20:5n3 eicosapentaenoic acid EPA C24:1 nervonic acid C22:5n3 docosapentaenoic ...

Fatty acid methyl ester (FAME) analysis showing which fatty acids were in the samples, though not what specific lipids they were part of (triacylglycerides, phospholipids, etc.) https://en.wikipedia.org/wiki/Fatty_acid_methyl_ester

Values in Ark1!A2:AO21 are probably mass percent of total FAME, including C19:0 added for calibration. Sample identifiers are lab-local; GSF1 identifiers are in Ark5!A4:U22 but suffer from typos. Use caution and see below.

This workbook is a mess:

• Results appear in ...

Results of gas chromatography of fatty acid composition of feeds used in Study "GSF1: Salmon feed-switch experiment vegetable and fish oil 2015-2016", https://fairdomhub.org/studies/144.

Feed samples are identified by their EWOS feed number. Fatty acids are identified by ChEBI ID. Numbers in table are mass percentage of lipid fraction.

Details on recipes, pellet size etc for each feed ID are in https://fairdomhub.org/data_files/1308.

(The above clarifications required some detective work, which ...