Declining Wild Salmon Populations in Relation to Parasites from Farm Salmon

@article{Krkoek2007DecliningWS,
  title={Declining Wild Salmon Populations in Relation to Parasites from Farm Salmon},
  author={Martin Krko{\vs}ek and Jennifer S. Ford and Alexandra Morton and Subhash R. Lele and Ransom A. Myers and Mark A. Lewis},
  journal={Science},
  year={2007},
  volume={318},
  pages={1772 - 1775}
}
Rather than benefiting wild fish, industrial aquaculture may contribute to declines in ocean fisheries and ecosystems. Farm salmon are commonly infected with salmon lice (Lepeophtheirus salmonis), which are native ectoparasitic copepods. We show that recurrent louse infestations of wild juvenile pink salmon (Oncorhynchus gorbuscha), all associated with salmon farms, have depressed wild pink salmon populations and placed them on a trajectory toward rapid local extinction. The louse-induced… 
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References

SHOWING 1-10 OF 27 REFERENCES
Transmission dynamics of parasitic sea lice from farm to wild salmon
TLDR
A quantitative analysis of how a single salmon farm altered the natural transmission dynamics of sea lice to juvenile Pacific salmon is reported, which raises the infection pressure from the farm by an additional order of magnitude and creates a composite infection pressure that exceeds ambient levels for 75 km of the two migration routes.
Salmon-farming impacts on wild salmon
  • R. Hilborn
  • Environmental Science
    Proceedings of the National Academy of Sciences
  • 2006
TLDR
Data is presented to show that migrating juvenile salmon are infected by sea lice as they pass salmon farms and that suchSea lice infestations cause significant mortality in salmon farms.
Epizootics of wild fish induced by farm fish
TLDR
A comprehensive analysis of the spread and impact of farm-origin parasites on the survival of wild fish populations, including native parasitic sea lice transmission and pathogenicity on migratory wild juvenile pink and chum salmon populations.
Effects of host migration, diversity and aquaculture on sea lice threats to Pacific salmon populations
TLDR
The results characterize parasite threats of salmon aquaculture to wild salmon populations and show how host migration and diversity are important factors affecting parasite transmission in the oceans.
Temporal Patterns of Sea Louse Infestation on Wild Pacific Salmon in Relation to the Fallowing of Atlantic Salmon Farms
TLDR
Overall, L. salmonis levels were significantly reduced at the study sites during fallowing but returned to the original level after fallowing, and the decline was age specific.
Lifetime success and interactions of farm salmon invading a native population
TLDR
It is indicated that such annual invasions of farm salmon have the potential for impacting on population productivity, disrupting local adaptations and reducing the genetic diversity of wild salmon populations.
First Report of a Sea Louse, Lepeophtheirus salmonis , Infestation on Juvenile Pink Salmon, Oncorhynchus gorbuscha , in Nearshore Habitat
TLDR
Abundance and intensity of Sea Louse infestation were significantly higher in juvenile Pink Salmon in close proximity to salmon farms, than in Pink Salmon distant from salmon farms.
Rapid worldwide depletion of predatory fish communities
TLDR
The analysis suggests that management based on recent data alone may be misleading, and provides minimum estimates for unexploited communities, which could serve as the 'missing baseline' needed for future restoration efforts.
...
...