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Diseases of Aquatic Organisms

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DAO 97:47-56 (2011)  -  DOI:

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

Lars Are Hamre1,*, Frank Nilsen1,2

1Department of Biology, University of Bergen, PO Box 7800, Bergen 5020, Norway
2Institute of Marine Research, PO Box 1870, Nordnes 5817, Norway

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 pre-adult/adult lice. 

KEY WORDS: Salmon louse · Vaccine · Dose efficacy assay · Drug · Mortality · Loss

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Cite this article as: Hamre LA, Nilsen F (2011) Individual fish tank arrays in studies of ­Lepeophtheirus salmonis and lice loss variability. Dis Aquat Org 97:47-56.

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