Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Replacing fish oil with pre-extruded carbohydrate in diets for Atlantic salmon, Salmo salar, during their entire marine grow-out phase: Effects on growth, composition and colour

Published source details

Young A., Morris P.C., Huntingford F.A. & Sinnott R. (2006) Replacing fish oil with pre-extruded carbohydrate in diets for Atlantic salmon, Salmo salar, during their entire marine grow-out phase: Effects on growth, composition and colour. Aquaculture, 253, 531-546


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Use an alternative protein source: plant-based Sustainable Aquaculture

Between 2002 and 2003, a randomised, replicated study in Scotland (Young et al., 2006) found that diets containing maize- and pea-based protein plus carbohydrates (to replace fish oil) achieved similar growth rates in salmon smolts, Salmo salar. Over 377 days, fish across all groups grew from an average 52g to between 1.9kg and 2.5kg. Salmon smolts fed low-energy feeds (containing less fish oil and more carbohydrate) had a lower body condition compared with those fed high-energy feeds (containing more fish oil and less carbohydrates). Nine experimental diets were produced containing different levels of vegetable protein, carbohydrate and fish oil. Groups of salmon smolts were fed one of the experimental diets for 377 days during their marine grow-out phase. Fish were fed using automated feeders. Growth rates, weights and body condition were measured.