Sammendrag
Lice shielding skirts are a preventative measure against salmon lice in Atlantic salmon farming. The skirt is
wrapped around the top meters of the net cage to divert the current flow around the cage, and thereby keep the
salmon lice out. Despite these skirts being used actively in Norwegian aquaculture for the past decade, there is no
standardised way of using them, and therefore type, depth and operating procedures vary between sites. The
academic literature on the lice shielding efficiency of these skirts is not extensive and reported efficiency varies
across studies and sites with some reporting favourable results, while others find none. Some also report of
welfare related issues, with dissolved oxygen levels being the most prevalent, but this too varies across sites and
through the production cycle.
The aim of this paper is to provide a comprehensive overview and summary of relevant academic and grey
literature from the last decade to identify knowledge gaps that must be filled to achieve optimal use of lice
shielding skirts. This paper focuses on three main topics: lice shielding efficiency, interaction with the current
flow and rearing challenges. The positive results from some sites indicate that skirts have potential as a tool
against salmon lice, however, to create a best practice recommendation for skirt use, more knowledge is
necessary on the interaction between skirt and the environment, and sufficient monitoring procedures and
decision-making tools must be established.
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