Effect of exposure on salmon lice Lepeophtheirus salmonis population dynamics in Faroese salmon farms

Esbern J. Patursson, Knud Simonsen, Andre Visser, Øystein Patursson

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Abstract

We assessed variations in salmon lice Lepeophtheirus salmonis population dynamics in Faroese salmon farms in relationship to their physical exposure to local circulation patterns and flushing with adjacent waters. Factors used in this study to quantify physical exposure are estimates of the freshwater exchange rate, the tidal exchange rate and dispersion by tidal currents. Salmon farms were ranked according to the rate of increase in the average numbers of salmon lice per fish. In a multiple linear regression, physical exposure together with temperature were shown to have a significant effect on the rate of lice infection. The sites with low exposure revealed higher rates of self-infection and internally driven outbreak dynamics, while high-exposure sites showed lower rates of self-infection, tending towards externally driven outbreak dynamics. The lowexposure sites also appeared to have a lower threshold of salmon stocking numbers for outbreaks of infection. The study presents a simple method of characterizing salmon farming fjords in terms of their different exposure levels and how they relate to potential self-infection at these sites
Original languageEnglish
JournalAquaculture Environment Interactions
Volume9
Issue number1
Pages (from-to)33-43
ISSN1869-215X
DOIs
Publication statusPublished - 2017

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