Fish need nutrients, not raw materials. In the wild, salmon eat small prey from the river before migrating to the sea, and other types of prey, such as fish and crustaceans, during the saltwater phase. Today, farmed salmon are fed dry feed in the form of pellets. Each pellet is packed with the nutrients that the salmon need: fat, proteins, carbohydrates, vitamins and minerals. All raw materials also contribute undesirable substances.
Farmed salmon today are eating less marine ingredients and more plant ingredients than before. As long as the salmon’s nutrient requirements are covered and the feed is safe for the fish, what raw materials are used is less important. NIFES studies the nutrient requirements of fish and the effect of various nutrients and other substances in the feed on the health, welfare and development of the fish.
- By-products from fish and other marine ingredients
- The nutrient requirements of fish
- Live feed
- Environmental impact
- Monitoring of fish feed
- Plan ingredients in fish feed
- How small a proportion of fish can there be in fish feed?
- What undesirable substances are transferred from the feed to the fillet?