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Individual fish tank arrays in studies of Lepeophtheirus salmonis and lice loss variability

Hamre, Lars Are; Nilsen, Frank
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/109132
Date
2011-11-03
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Original version
http://dx.doi.org/10.3354/dao02397
Abstract
In studies of the salmon louse Lepeophtheirus salmonis (Krøyer, 1837), experimental

design is complicated by a highly variable and unpredictable lice loss among common experimental

tanks and a substantial rate of host transfer within tanks. When fish hosting L. salmonis are

maintained in individual tanks, unspecific effects such as host transfer, louse predation by cohabitant

hosts and agonistic host interactions are excluded. This study suggests that it is possible to

maintain Atlantic salmon Salmo salar infected with L. salmonis in an array of small, single fish

tanks and, by doing so, provide an experimental system in which the loss of motile pre-adult and

adult stages of L. salmonis is predictable. Here, lice can be collected shortly after detachment for

detailed studies or to provide mortality curves of lice from individual fish. This represents an

experimental approach improving precision in studies of L. salmonis, such as drug and vaccine

efficacy assays, RNA interference (RNAi) studies and host−parasite interactions. The natural loss

of pre-adult/adult L. salmonis from the system was higher for males than females. The loss of

females appeared to be a process somewhat selective against large individuals. Inherent qualities

of the host appeared to be of little significance in explaining the variability in loss of preadult/

adult lice.
Publisher
Inter-Research
Journal
Diseases of Aquatic Organisms

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