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. 2013 Mar;36(3):273-81.
doi: 10.1111/jfd.12054. Epub 2013 Jan 9.

Impact of Lepeophtheirus salmonis infestations on migrating Atlantic salmon , Salmo salar L., smolts at eight locations in Ireland with an analysis of lice-induced marine mortality

D Jackson  1 , D Cotter, J Newell, S McEvoy, P O'Donohoe, F Kane, T McDermott, S Kelly, A Drumm
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Free PMC article

Impact of Lepeophtheirus salmonis infestations on migrating Atlantic salmon , Salmo salar L., smolts at eight locations in Ireland with an analysis of lice-induced marine mortality

D Jackson et al. J Fish Dis. 2013 Mar.
Free PMC article

Abstract

Sea lice infestation as a source of marine mortality of outwardly migrating Atlantic salmon smolts has been investigated by treating groups of ranched salmon, prior to release, with a prophylactic sea lice treatment conferring protection from sea lice infestation. A number of studies have been carried out in Ireland using both established ranched populations and groups of hatchery reared fish imprinted for 5-8 weeks in the sites of experimental releases. In this study, data on 352 142 migrating salmon from twenty-eight releases, at eight locations along Ireland's South and West coasts covering a 9-year period (2001 to 2009) are reviewed. Both published and new data are presented including a previously unpublished time series. The results of a meta-analysis of the combined data suggest that while sea lice-induced mortality on outwardly migrating smolts can be significant, it is a minor and irregular component of marine mortality in the stocks studied and is unlikely to be a significant factor influencing conservation status of salmon stocks.

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Figures

Figure 1
Figure 1
Locations of release points.
Figure 2
Figure 2
Percentage of salmon returning for each treatment group with Lowess smoother.
Figure 3
Figure 3
Percentage of salmon returning by location and date with Lowess smoother.
Figure 4
Figure 4
ANOVA: plot of adjusted mean percentages, all data.
Figure 5
Figure 5
ANOVA plot of adjusted mean percentages, Burrishoole and Bundorragha (Delphi) time series.
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Comment in

References

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