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Published 2021

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Publication details

Journal : Aquaculture Reports , vol. 21 , p. 1–10 , 2021

Publisher : Elsevier

International Standard Numbers :
Printed : 2352-5134
Electronic : 2352-5134

Publication type : Academic article

Contributors : Samuelsen, Tor Andreas; Hillestad, Marie; Jacobsen, Hans Jakup; Hjertnes, Tor Johannes; Sixten, Hanne Jorun


The aim of this study was to investigate the effect of starch content and pellet physical quality on the biological response in Atlantic salmon. Salmon feeds with a large variation in physical quality were produced by the adjustment of dietary starch inclusion (92 g kg−1 or 64 g kg−1), preconditioner oil (0.0 or 11.0 kg h−1), extruder moisture addition (13.5 or 27 kg h−1) and drying temperature (38 °C or 70 °C). The variables impacted physical quality for the 12 feed codes and with hardness S (standing) and Durability measured in the range of 39–212 N and 39–94 %, respectively. Gently dried feed (38 °C) was harder and more durable than conventionally dried (70 °C). This could be explained by the phase transition theory and drying in the mobile rubbery phase above the glass transition temperature (Tg) for the gently dried feed codes. All feed codes were evaluated in Atlantic salmon performance and digestibility trials. There was a significant difference between the codes for weight gain (%; P