The aim of this thesis was to investigate an alternative way to detect salmon lice (Lepeophtheirus salmonis) in the field, and investigate the possibility of counting salmon lice in a commercial farming facility of Atlantic salmon (Salmo salar) by using methods and tools based on environmental DNA (henceforth referred to as eDNA). This was performed by sampling water in a salmon farming facility over a couple of months, collecting live salmon lice at a local salmon slaughter factory and conducting an experiment in a laboratory under a controlled environment
