By-Catch And Offal Feed From The Herring Industry - Performance Of Atlantic Salmon As Concerns Growth, Feed Utilisation And Fillet Quality

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In the beginning of last decade (1991) the idea and research on heat-coagulated feed, produced mainly from offal from the pelagic fishing industry, started. The objective was higher/better economicutilisation of, at that time, a low-cost product. Freshly produced offal was evaluated chemically andfound to be rich in protein, lipid (with large parts of highly unsaturated n-3 fatty acids), vitamins A and D, several minerals, and with ash contents quite low (lo-12%). Protein quality was evaluated by analyses of volatile nitrogen and mink-digestibility, and fresh offal was found to hold LT-fish meal quality, while stored offal rapidly lost,quality. The on-line production technique of growers feed for the salmon industry started. During the decade several research projects, each including several fish experiments, was carried out. Some results from two of the experiments will be presented in this conference.