Nofima reports

Rapport/Report 8/2014 English summary

Albrektsen, Sissel; Lock, Erik-Jan; Bæverfjord, Grete; Pedersen, Mona Elisabeth; Krasnov, Aleksei; Takle, Harald Rune; Veiseth-Kent, Eva; Ørnsrud, Robin; Waagbø, Rune; Ytteborg, Elisabeth

Publication details

Publisher: Nofima AS

Issue: 8/2014

Number of pages: 49

International Standard Numbers:
Printed: 978-82-8296-164-6

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.