Nofima reports

Rapport/Report 32/2016 - English summary

Aas, Turid Synnøve; Ytrestøyl, Trine; Berge, Gerd Marit

Publication details

Publisher: Nofima AS

Issue: 32/2016

Number of pages: 19

International Standard Numbers:
Printed: 978-82-8296-406-7

Open Access: green


Sludge from a land based smolt producer was sampled at given times during the day, once a month over a period of four months, at different temperatures and with varying biomass in the farm. The dry matter content of the sludge varied, and this variation was probably caused by varying amounts of spill feed in the sludge, where increasing amounts of spill feed increased the dry matter content of the sludge.
A model for estimation of amount of spill feed in sludge was made, based on analysis of energy content in the dry matter of sludge.
The model was used to estimate amount of feed in collected samples of sludge, and the calculations showed that dry matter content of sludge was related to the amount of spill feed.