Changes in epidemiological patterns of sea lice infestation on farmed Atlantic salmon, <i>Salmo salar</i> L., in Scotland between 1996 and 2006

Lees, F.; Gettinby, G.; Revie, Crawford W.

doi:10.1111/j.1365-2761.2007.00897.x

Cited by 41 publications

(70 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The patterns identified in this study indicate a link between local salmon farm production cycles and infestations of wild trout smolts, consistent with high levels of infestation during years when lice levels on farms are high (Revie et al 2002;Lees et al 2008) and with previous small-scale studies (Butler 2002;Hatton-Ellis et al 2006). The significant relationship across years at the intensively studied Shieldaig site was mirrored through 2002 -2003 across sites throughout the west coast.…”

Section: Discussionsupporting

confidence: 86%

Temporal and spatial patterns of sea lice levels on sea trout in western Scotland in relation to fish farm production cycles

et al. 2010

View full text Add to dashboard Cite

The relationship between aquaculture and infestations of sea lice on wild sea trout (Salmo trutta) populations is controversial. Although some authors have concluded that there is a link between aquaculture and lice burdens on wild fish, others have questioned this interpretation. Lice levels have been shown to be generally higher on Atlantic salmon farms during the second years of two-year production cycles. Here we investigate whether this pattern relates to lice burdens on wild fish across broad temporal and spatial axes. Within Loch Shieldaig across five successive farm cycles from 2000 to 2009, the percentage of sea trout with lice, and those above a critical level, were significantly higher in the second year of a two-year production cycle. These patterns were mirrored in 2002 -2003 across the Scottish west coast. The results suggest a link between Atlantic salmon farms and sea lice burdens on sea trout in the west of Scotland.

show abstract

Section: Discussionsupporting

confidence: 86%

Temporal and spatial patterns of sea lice levels on sea trout in western Scotland in relation to fish farm production cycles

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The greater the density of hosts, the more severe an outbreak (Anderson & May 1991). Likewise, large hosts can carry a greater number of parasites (Lees et al 2008, Heuch et al 2009, Jansen et al 2012), increasing contact rates and exposure time (Jackson & Minchin 1992, Tucker et al 2002. The complexity of host density on sea lice population dynamics is further increased by 'the dilution effect', a negative relationship between host density and infection intensity (Samsing et al 2014).…”

Section: Discussionmentioning

confidence: 99%

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

Patursson¹,

Simonsen²,

Visser³

et al. 2017

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

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.

show abstract

“…A linear regression model was also used by Lees et al (2008a) who similarly found that post-treatment L. salmonis abundance was higher in second-year fish. In general, L. salmonis abundance can be higher during the second year of production at sea (Saksida et al 2007, Lees et al 2008c.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of emamectin benzoate for treatment of Lepeophtheirus salmonis on farmed Atlantic salmon Salmo salar in the Bay of Fundy, Canada

Jones¹,

Hammell²,

Dohoo³

et al. 2012

Dis. Aquat. Org.

View full text Add to dashboard Cite

Emamectin benzoate (an avermectin chemotherapeutant administered to fish as an in-feed treatment) has been used to treat infestations of sea lice Lepeophtheirus salmonis on farmed Atlantic salmon Salmo salar in the Bay of Fundy, New Brunswick, Canada, since 1999. This retrospective study examined the effectiveness of 114 emamectin benzoate treatment episodes from 2004 to 2008 across 54 farms. Study objectives were to establish whether changes in the effectiveness of emamectin benzoate were present for this period, examine factors associated with treatment outcome, and determine variables that influenced differences in L. salmonis abundance after treatment. The analysis was carried out in 2 parts: first, trends in treatment effectiveness and L. salmonis abundance were explored, and second, statistical modelling (linear and logistic regression) was used to examine the effects of multiple variables on post-treatment abundance and treatment outcome. Post-treatment sea lice abundance increased in the later years examined. Mean abundance differed between locations in the Bay of Fundy, and higher numbers were found at farms closer to the mainland and lower levels were found in the areas around Grand Manan Island. Treatment effectiveness varied by geographical region and decreased over time. There was an increased risk for unsuccessful treatments in 2008, and treatments applied during autumn months were more likely to be ineffective than those applied during summer months.

show abstract

Changes in epidemiological patterns of sea lice infestation on farmed Atlantic salmon, Salmo salar L., in Scotland between 1996 and 2006

Cited by 41 publications

References 24 publications

Temporal and spatial patterns of sea lice levels on sea trout in western Scotland in relation to fish farm production cycles

Temporal and spatial patterns of sea lice levels on sea trout in western Scotland in relation to fish farm production cycles

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

Effectiveness of emamectin benzoate for treatment of Lepeophtheirus salmonis on farmed Atlantic salmon Salmo salar in the Bay of Fundy, Canada

Contact Info

Product

Resources

About