Salmon lice--impact on wild salmonids and salmon aquaculture.

river; P < 0.001) and release date ( P = 0.001) were both more highly significant than treatment ( P = 0.034) and an approximately 1% difference between treated and control groups.

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Releases of Burrishoole grilse stock smolt from western Ireland from 2001 to 2008 resulted in a clear trend in which treated fish returned in higher numbers in 9 of 10 years ( Jackson et al . 2011b ), and the differences were statistically significant in 4 of 10.

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