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A better understanding is needed of their spatial distribution and early life history to disrupt the life cycle of the sea louse. In this study, sea lice larval densities within salmon farms, between salmon farms and reference sites, and at various depths were quantified using both plankton pumps and plankton nets. Farm sites exhibited significantly higher densities than reference sites; however, these densities dropped an order of magnitude at a distance of 100\u00a0m from the cages. The majority of the larvae captured in the study were nauplii (93%), and densities ranged from 0 to 10 larvae\/m<jats:sup>3<\/jats:sup>. Free\u2010swimming sea lice larvae were found to exhibit a diel cycle where nauplii larvae were in deeper waters (10\u201317\u00a0m) during the day and in surface waters (1\u20136\u00a0m) during the night. 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