Aquaculture Europe 2023

September 18 - 21, 2023


Add To Calendar 21/09/2023 10:30:0021/09/2023 10:45:00Europe/ViennaAquaculture Europe 2023OPTIMALIZATION OF THE MACRONUTRIENT COMPOSITION IN THE ATLANTIC HALIBUT DIETStrauss 2The European Aquaculture Societywebmaster@aquaeas.orgfalseDD/MM/YYYYaaVZHLXMfzTRLzDrHmAi181982


Ø. Sæle1*, A. J. P. Philip1, K. Hamre1, K. Kousoulaki2 , K. S. Sollien3, V. Helsengreen1,3, K. Vestrheim1,3 and Ivar Rønnestad3.


1 Institute of Marine  Research, Nordnesgaten 50, Bergen, Norway (

2 Nofima , Muninbakken 9-13, Breivika. Tromsø, Norway

3 Dep. of Biological Sciences, UiB , Thormøhlens gate 53 A/B, Bergen Norway


 Farming of Atlantic halibut had its modest start in the 1980s and has  slowly grown into an industry that sold 1900 metric tons in 2020.  This has been a challenging endeavor where one bottle neck has replaced the next, and the first decades were largely dedicated  to solving difficulties related to larval development.  However, the industry has endured, and the current focus has moved  from early development to optimalization growth and welfare to market size. We have therefore investigated the effect of varying levels of the macronutrients (protein, lipids and carbohydrates) on  the grow out phase.  Twelve diets were designed ranging in protein from  45 to 77 %, lipids ranging from 5 to 30 % and  carbohydrates from 5 to 25 % of the diet. This represents a three-component mixture design, allowing analysis of the mixed effect of the factors on the fish.  Atlantic halibut juveniles (mean weight, 300 g ; 120 in each tank) were randomly distributed to 15 tanks  for one year .

The effect of macronutrients on growth changed during the growth period. In the start of the trial both high levels of carbohydrate and lipid had a negative effect on SGR, whereas the negative effect of high carbohydrate was less important toward the end of the trial.  There was no effect of diet composition on digestibility of lipids and proteins. Muscle composition was not affected by diet composition,  but the liver composition reflected dietary variations. Effects on appetite and welfare  will be presented and discussed.