Publisher: Nofima AS
Number of pages: 49
International Standard Numbers:
Open Access: none
The aim of the present study was to solubilize P in fish bones and make this limited mineral resource more available in order to contribute to a more sustainable, cost-efficient and environmentally friendly use of marine feed resources. A technological process using acid treatment of cut-offs from herring was developed and optimized to produce fish bone hydrolysate (FBH). The utilization of P from FBH was tested in a 13 week feeding trials with Atlantic salmon smolt. The results showed that approximately 90% of P in herring bones can be solubilized and that the availability was equally high as for crystalline P (mono Na-P) in smolt, efficiently sustaining normal growth, mineralization and skeletal development. Soluble P at 0.7 % in the diet after sea water transfer covered the P requirement. By formulating feeds with P close to the P requirement, maximum P digestibility and retention in addition to reduced environmental impact can be achieved.