Temporal and spatial variations in lice numbers on salmon farms in the Hardanger fjord 2004-06
- Heuch, P.A.
- Olsen, R.S.
- Malkenes, R.
- Revie, C.W.
- Gettinby, G.
- Baillie, M.
- Lees, F.
- Finstad, B.
- Fisheries and Aquaculture Industry Research Fund (Funder)
- Norwegian Research Council (Funder)
DOIAbstract
The long and narrow Hardanger fjord in western Norway has a high density of salmon farms and has had severe salmon lice, Lepeophtheirus salmonis, problems. In the years 2004-06, salmon lice numbers were recorded in selected salmon farms in the fjord as part of a larger research project. Most farm sites participated in a strategic control programme and were deloused between November and January in each year. The aim of the programme was to achieve a mean abundance of <0.3 adult female lice at this time and to minimize the infection pressure on wild smolts in the spring. Dedicated teams carried out detailed counting of lice on farmed fish in April-September each year. Temperature conditions were fairly similar throughout the fjord and amongst...
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