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Published 2022

Read in Norwegian

Publication details

Publisher : Nofima AS

International Standard Numbers :
Printed : 978-82-8296-713-6

Publication type : Nofima’s reports

Contributors : Andersen, Øivind; Tveiten, Helge; Thesslund, Tina H.E.; Kleppen, Hans-Petter

Series : Nofima rapportserie 11/2022

Year : 2022

Research areas

Farmed fish

If you have questions about the publication, you may contact Nofima’s Chief Librarian.

Kjetil Aune
Chief Librarian
kjetil.aune@nofima.no

Summary

Sterile farmed salmon would reduce the negative interactions between escapees and wild salmon and improve fish welfare and
quality. The main goal of this project has been to evaluate important production traits in sterile salmon after ablation of the
primordial germ cells. Transient inactivation of the embryonic germ cell factor Deadend caused lifelong loss of gametes in both
males and females. The sterile salmon showed normal osmoregulatory ability and seawater tolerance. No consistent differences
were shown in stress-response and immune status by cortisol measurement and qPCR quantification of multiple stress-related
and pro-and anti-inflammatory factors. Sterile salmon showed robustness in seawater despite extreme weather conditions and
serious sea lice attack. External wounds, fin damages and abdominal bleedings were registered in sterile and fertile salmon
with only sporadic malformations. Sterile and fertile salmon showed similar growth performance in freshwater, but the
comparison in sea water is uncertain due to few fertile fish left. Sex hormone synthesis was induced in both sterile and fertile
males, but sex steroid levels decreased in sterile fish after seawater transfer. The project concludes that embryonic Deadend
inactivation results in sterile salmon with the same phenotype as fertile fish, except for the missing gametes, and recommends
that technology should be developed for large-scale production of sterile salmon in aquaculture.

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