Estimating the dispersal of Lepeophtheirus salmonis sea lice within and among Atlantic salmon sites of the Bay of Fundy, New Brunswick

The objective of this study was to estimate the impact of infestation pressures on the abundance of the parasitic sea louse, Lepeophtheirus salmonis, in the Bay of Fundy, New Brunswick (NB), Canada, using the Fish‐iTrends database for the years 2009–2018. Infestation pressures were calculated as tim...

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Bibliographic Details
Published in:Journal of fish diseases 2021-12, Vol.44 (12), p.1971-1984
Main Authors: Parent, Marianne I., Stryhn, Henrik, Hammell, K. Larry, Fast, Mark D., Grant, Jon, Vanderstichel, Raphaël
Format: Article
Language:English
Subjects:
Abundance
Aquaculture
aquatic epidemiology
Atlantic salmon
Crustaceans
Dispersal
Dispersion
External pressure
Farms
Fish
Fish‐iTrends
Freshwater fishes
Infestation
infestation pressure
Lepeophtheirus salmonis
Lice
Marine fishes
Mathematical analysis
Salmo salar
Salmon
sea lice
Synchronism
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Summary:The objective of this study was to estimate the impact of infestation pressures on the abundance of the parasitic sea louse, Lepeophtheirus salmonis, in the Bay of Fundy, New Brunswick (NB), Canada, using the Fish‐iTrends database for the years 2009–2018. Infestation pressures were calculated as time‐lagged weighted averages of the abundance of adult female (AF) sea lice within a site (internal infestation pressure: IIP) and among sites (external infestation pressure: EIP). The EIP weights were calculated from seaway distances among sites and a Gaussian kernel density for bandwidths of 5 to 60 km. The EIP with a bandwidth of 10 km had the best fit, as determined with Akaike's information criterion, and historical AF sea lice abundance. This estimated dispersal distance of 10 km was similar to previous studies in Norway, Scotland and in New Brunswick. The infestation pressures estimated from empirical AF sea lice abundance within and among sites significantly increased the abundance of AF sea lice (p 
ISSN:0140-7775
1365-2761
DOI:10.1111/jfd.13511