11/20/2023 0 Comments Atlantic salmonSalmon guts and offcuts are not waste, they are valuable residual raw materials that can be reintroduced into the food chain,” says Kathrine Kjos Five, another industrial PhD candidate working at Nutrimar. This means we have to make maximum use of the resources that are already available to us, in addition to producing completely new types of feed ingredients. “The Government set a goal in the Hurdal Platform stating that all feed for Norwegian animals and fish must be 100 per cent sustainable by 2030. Today’s salmon feed accounts for more than 75 per cent of greenhouse gas emissions from the salmon industry. It is consequently perfectly safe to use salmon leftover raw material in salmon feed. Wild salmon have nothing against a little cannibalism, and other species such as cod are cannibals to a much greater extent. It doesn’t look very appetizing, but the salmon enjoy it. Spray-dried hydrolysate is used in the research. Salmon oil, salmon meal, concentrated salmon hydrolysate, and spray-dried salmon hydrolysate. They only distinguish between what fits into their mouth and what doesn’t,” she explains. In the wild, predatory fish don’t differentiate between species. “You might think this is cannibalism? It’s not, however, because the proteins have been broken down so much that their origin is not recognizable without conducting DNA analyses,” says Sandbakken. Norwegian legislation permits the use of salmon oil and salmon hydrolysate in salmon feed, and salmon are happy to eat it. The advantages of using hydrolysate are that it is easily digestible and tastes good, so that the fish eat more.Ĭurrently, salmon hydrolysate is mainly used in pet food, but there is nothing stopping it from being used by the salmon industry instead. The hydrolysate can then be reintroduced into the food chain by giving it to salmon. “The enzymes cleave the bonds that exist between amino acids in the proteins to form peptides and free amino acids,” says Sandbakken. These are found naturally in the stomachs of fish (and humans) and help digest food and break down nutrients into smaller pieces that can then be absorbed into the intestines. Salmon hydrolysate is produced when leftover raw materials have been broken down with the help of enzymes. SHOW MORE So, what is salmon hydrolysate? Kathrine Kjos Five and Ingrid Schafroth Sandbakken are working together to better use salmon byproducts. The research is funded by Nutrimar and the Research Council of Norway through the Industrial PhD scheme. Nutrimar processes leftover raw materials that they source from Salmar at Frøya. “These leftovers can be used to produce salmon oil, salmon meal and salmon hydrolysate, which is what we do at Nutrimar,” says Sandbakken. This can of course be boiled to make stock, but it can also be used for many other purposes. However, after a salmon has been filleted, there is still a lot of food left over. Much of Norway’s salmon exports consist of salmon where only the intestines have been removed. Instead, we could use this remaining raw material to make food or salmon feed ingredients in Norway,” says Ingrid Schafroth Sandbakken, an industrial PhD candidate at Nutrimar in Trondheim, who is affiliated with the Faculty of Natural Sciences at NTNU. “Norway currently exports a lot of whole salmon, which include the head, skin and bones. Using locally produced raw materials is also good for the environment. Using a larger proportion of each individual salmon here in Norway will make the aquaculture industry less dependent on importing ingredients for salmon feed. Denne saken er også tilgjengelig på norsk
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