Resistens hos lakselus

Veterinærinsituttet overvåker følsomhet og resistens mot legemidler hos lakselus.

Formål med programmet er å gi en best mulig beskrivelse av lakselus sin følsomhet mot legemidler, samt gi råd om bruk av legemidler for å kontrollere lakselus hos oppdrettsfisk.


The number of medicinal treatments applied against salmon lice was reduced in 2018. This continued a yearly trend that started in 2015. Despite this, the level of resistance seen in salmon lice remained high in 2018. However, the tendency towards a reduction in the level of resistance that started in 2017, continued in 2018. Resistance towards deltamethrin, azamethiphos and emamectin benzoate were generally widespread along the Norwegian coast. Less resistance was found towards hydrogen peroxide than towards the other medicines, but loss of sensitivity was indicated in several areas. 484 prescriptions for medicines against salmon lice were prescribed in 2018, which was a 38 percent reduction compared to 2017. The number of non-medicinal treatments increased with 21 percent, to 2023 reported treatments, in the same period. Non-medicinal methods for treatment and prevention were thereby the dominating
methods for salmon lice control. Thermic delousing accounted for 68 percent of the non-medicinal treatments in 2018.

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