Nofima reports

Rapport/Report 40/2015 – English summary

Holan, Astrid Buran; Kolarevic, Jelena

Publication details

Publisher: Nofima AS

Issue: 40/2015

Number of pages: 15

International Standard Numbers:
Printed: 978-82-8296-334-3

Open Access: green


Lerøy Midnor initiated this project in order to close knowledge gaps for production in closed systems with recycled seawater on land. 150,000 smolts were transferred to sea (cages 14, Slåttholmen), while 150,000 smolts from the same batch were redistributed in six tanks with recycled brackish water for post-smolt production on land. The post-smolts were after a period transferred to sea (cages 15, Slåttholmen).
The water quality values were within recommended limits for post-smolt on land, except for CO2 concentrations that exceed recommended limit. No severe damage was found to the post-smolt, and no sexually matured fish.
The post-smolt on land had higher SGR and lower TGC than the control group in the sea, while after the transfer of post-smolt to sea, the post-smolt showed both a higher SGR and TGC, and at the end of the post-smolt had a higher weight, lower mortality and less sea lice infestation. The post-smolt handled the sea lice treatment better then the control group.