Líffræðifélag Íslands - biologia.is
Líffræðiráðstefnan 2023
Höfundar / Authors: Elísabet E. Guðmundsdóttir (1), Hörður Guðmundsson (1), Ólafur H. Friðjónsson (1), Gunnar Ö. Kristjánsson (2), Hanna Tuomisto (3), Marja Roitto (3), Mohammad El-Wali (3), Roya Sardari (4), Martin Hedström (4), Eva Nordberg Karlsson (4)
Starfsvettvangur / Affiliations: (1) Matís, Reykjavik, Iceland (2) Laxá Feedmill Ltd (3) University of Helsinki (4) University of Lund
Kynnir / Presenter: Elísabet Eik Guðmundsdóttir
With warmer climates, grain farming is a growing industry in Northern Europe. Agrifood production creates large amounts of side streams and by-products calls for strategic waste management. The Nordic Cereals project aimed to valorise side streams accumulating from processing of oat, rich in polysaccharides, proteins and minerals. A focus was on utilizing carbohydrate rich side-streams for production of Single Cell Proteins (SCP) for aquaculture feed. A fibre rich side-product from oat processing was hydrolysed enzymatically to degrade complex carbohydrates and release mono- and di-saccharides as substrates for microbial growth. Through the release of sugar, the spent oat fibre is enriched in proteins. The hydrolysate liquid fraction contained mainly glucose, suited for cultivation of yeast SCP. Growth on the experimental media was confirmed for several yeast strains and one evaluated for potential as feed additive in aquaculture. Experimental feed formulations were made with S. cerevisiae and protein enriched oat fibre, together and separately, and tested in Atlantic salmon. Effects were evaluated on growth, gut microbiome composition, gut health and sensory evaluation of salmon products. The results indicate that oat products have potential as ingredients in aquaculture feeds including yeast SCP grown on hydrolysed oat fibre.