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The surveillance programme for resistance to chemotherapeutants in salmon lice (Lepeophtheirus salmonis) in Norway 2014

Grøntvedt RN, Jansen PA, Horsberg TA, Helgesen K, Tarpai A. The surveillance programme for resistance to chemotherapeutants in L. salmonis in Norway 2014. Surveillance programmes for terrestrial and aquatic animals in Norway. Annual report 2014. Oslo: Norwegian Veterinary Institute 2015.

Results obtained in the surveillance program for resistance to chemotherapeutants in salmon lice show a pronounced increase in prescribed medicines used as delousing agents. Furthermore, reduced sensitivity and resistance to the medicines tested in bioassays are generally widespread along the coast, but seem less prominent in the far north and far south. Compared to the surveillance in 2013, however, there seems to be a loss of sensitivity to deltamethrin and azamethiphos in Finnmark. The
results for hydrogen peroxide were generally better than for other medicines, but loss of sensitivity was indicated in areas in Hordaland and Trøndelag.

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