Nofima reports

Rapport/Report 9/2014 English summary

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

Publication details

Publisher: Nofima AS

Issue: 9/2014

Number of pages: 43

International Standard Numbers:
Printed: 978-82-8296-166-0

Open Access: green


An experiment was conducted to study the utilization efficiency of P from fish bone hydrolysate (FBH) relative to a Na -P salt in Atlantic salmon fry. A low P diet (0.55% soluble P) was compared with FBH and Na-P at two levels (0.70% and 0.85% soluble P) in triplicates from start feeding until 30 g size. The results were evaluated based on growth, mortality, mineral analysis and X-ray, and by histopathology, FTIR, transcriptomics (qPCR) and enzymes (ALP, TRAP). Fish fed a low P diet showed clear P-deficiency signs. Fish fed FBH1 showed some small differences in histology, FTIR and gene expression in the bones of 15g fish corresponding to findings in the low P diet. This was not found for FBH2. Overall, results indicated that P hydrolyzed from the bone fraction of herring trimmings can be effectively utilized to maintain normal growth, mineralization and bone development of salmon fry, but that the availability of P may be slightly lower than that of Na–P in the early salmon fry stage until the fish reaches approximately 15 g size.