Award for fishmeal replacement study

The award is part of the “International Symposium on
Fish Nutrition and Feeding” (ISFNF), this year held in
Brazil, Florianópolis, June 2-5, 2008.In her study, cod weighing 140 grams
were fed feed with mixtures of soy meal, soyprotein concentrate, corn gluten and
wheat gluten. The inclusion levels of the raw materials differed.

Raw
materials like soy meal, wheat gluten and soy protein concentrate appeared to
have the most positive effect on the cod’s growth and health, “says Hansen.

In a new trial different protein mixtures of these raw materials was
made. Fish meal was replaced by plant proteins from 0 to 100 %. The feed was
given to cod of about 1.6 kilograms.

It was shown that replacement levels
up to 50 % had no negative effect on the growth or the health of the cod. Growth
and feed utilisation was reduced by replacing over 50% of fish meal with plant
meal, says Hansen. However, replacement levels just over 50 % is unlikely to
affect the cod negatively provided that amino acids, vitamins and minerals
common in fish meal but in short supply in plant protein is added to the
feed.

At the 100 % replacement level intestinal changes which resembles
inflammatory conditions was observed in the cod. Cod need more proteins than
salmon, and seems to have a higher tolerance for soy protein than
salmon.

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