REPLACEMENT OF FISH MEAL BY TWO
VEGETABLE PROTEIN RESOURSES (SOYBEAN AND CORN-GLUTEN) AND THEIR EFFECT ON
GROWTH, FEED UTILISATION, RETENTION AND FISH HEALTH IN DIETS FOR ATLANTIC
COD (Gadus
morhua).
A.-C. Hansen, K. Tveit, G. Rosenlund, O. Karlsen, A. Mangor-Jensen, G.I. Hemre
Diets for the strict carnivorous
Atlantic cod have so far been based on high protein levels and quality,
necessary to obtain high growth rates, efficient utilisation of the protein
and good fish health. To use only high-quality fish meal and oil in diets
to cod will not be sustainable in future, due to high costs and
expected limitations in raw material availability. Using earlier findings
on recommended balance between protein, lipid and starch in diets for
Atlantic cod, a trial was set up to elucidate the effect of replacing fish
meal by fat-extracted soy-bean meal, corn-gluten meal or a mixture of
these, in a regression design, using iso-nitrogenous and isocaloric diets.
Growth and feed utilisation were affected by increases in vegetable protein,
and where corn-gluten exerted the major effect. Soybean influenced
production results to a minor extent when limiting additions to below 20% of diet
dry matter. More details on this, feed utilisation, retention of
nutrients and fish health will be presented.
(NIFES (National Institute
of Nutrition and Seafood Research), Bergen, Norway)