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Nature 451, 23-24 (3 January 2008) | doi:10.1038/451023a; Published online 2 January 2008

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Aquaculture: The price of lice

Andrew A. Rosenberg1

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Wild salmon stocks in Canadian coastal waters are being severely affected by parasites from fish farms. So intense are these infestations that some populations of salmon are at risk of extinction.

The global demand for fish is on the rise, and farmed sources are taking much of the strain — the catch of wild fish has levelled off, and may well be declining1, but aquaculture production is expanding rapidly2. The ecological costs of that expansion can be heavy, however, as Krkos caronek et al.Science3.

  1. Andrew A. Rosenberg is at the Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, New Hampshire 03824-3525, USA.
    Email: andy.rosenberg@unh.edu

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