New BioMar diet focuses on IPN
Infectious pancreatic necrosis (IPN) is a serious viral disease in salmon farming that costs Norwegian farmers several 100 million NOK each year. A new BioMar diet focuses on reducing mortality caused by IPN.
Smolts seem especially vulnerable to IPN, but new research from BioMar shows that IPN mortality can be substantially reduced in smolt by providing a feed with an optimised fatty acid profile in the freshwater phase prior to transfer to sea.
Feeding with enhanced levels of Arachidonic acid (ARA) through smoltification gave a 46% increased survival from IPN infection in trials with IPN vaccinated smolts. Arachidonic acid is an essential fatty acid which amongst other things functions as a precursor for signal molecules in the immune defence of fish. The content of ARA is relatively high in natural prey for wild salmon in fresh water but very low in traditional raw materials used in fish feed. This will probably give the wild fish a better starting point for a successful smoltification when compared to farmed fish. This is part of the knowledge, which has been used by BioMar in the development of the new Focus Viral diet.