Published 2019

Read in Norwegian

Publication details

Publisher : Nofima AS

International Standard Numbers :
Printed : 978-82-8296-597-2

Publication type : Nofima’s reports

Contributors : Olsen, Stein Harris; Siikavuopio, Sten Ivar; Tobiassen, Torbjørn I; Heia, Karsten; Hustad, Anette; Kalberg, Monica

Series : Nofima rapportserie 18/2019

Year : 2019

If you have questions about the publication, you may contact Nofima’s Chief Librarian.

Kjetil Aune
Chief Librarian


The overall idea of this project was to increase the value of the production when farming rainbow trout (Oncorhynchus mykiss) in Norway through the combined production of fish for food as well as consumer eggs. From previous studies with rainbow trout from Svanøy AS we have seen a marked decrease in muscle color (astaxanthin content) with rainbow trout in the period right before the eggs are suitable for consumption. This contributes to quality deterioration of muscle; the paler fillet being classed as lower quality. Trout cannot make astaxanthin themselves and depend on supply through the feed. To improve the pigmentation of the muscle; a trial was conducted to compare normal and increased levels of astaxanthin in the feed. The fish used in the project was bought as an "All female"group from AquaGen. Unfortunately, it turned out to be a mistake by the delivery, so that the fish was normally distributed male and female rainbow trout. This was not discovered until slaughter in the fall of 2018. The results showed that high levels of astaxanthin does not affect the muscle biochemical composition, roe color and muscle color as compared to the control group.