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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 21, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(6):912-920; doi:10.1093/icesjms/fsn056
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Genetic assignment identifies farm of origin for Atlantic salmon Salmo salar escapees in a Norwegian fjord

K. A. Glover, O. T. Skilbrei and Ø. Skaala

Institute of Marine Research, PO Box 1870, Nordnes N–5817, Bergen, Norway

Correspondence to K. A. Glover: tel: +47 55 236357; fax: +47 55 238531; e-mail: kevin.glover{at}imr.no.

Glover, K. A., Skilbrei, O. T., and Skaala, Ø. 2008. Genetic assignment identifies farm of origin for Atlantic salmon Salmo salar escapees in a Norwegian fjord. – ICES Journal of Marine Science, 65: 912–920.

This study represents the first example of genetic assignment being used to identify the farm of origin for escaped Atlantic salmon. Following reports by local fishers of escaped farmed salmon in Romsdalfjord, western Norway, baseline samples were collected from 16 cages located on seven operational farms. The baseline samples, in addition to 29 escapees, were screened for 15 microsatellite loci. Pairwise FST values between baseline samples varied from <0.001 to 0.154, indicating variable but significant genetic differences among them. Direct assignment of the escapees (data from 13 informative loci) demonstrated that the most likely origin of 21 of them was from a single baseline sample (5I) collected at one farm. At a probability of 0.01, between 25 and 29 of the escapees were rejected in 12 baseline samples, 19–21 escapees were rejected from another three baseline samples, and only seven of the escapees were rejected from baseline sample 5I. Consequently, these data demonstrate that most of the escapees most likely originated from a single farm, and importantly, that 15 of the 16 baseline samples could with high probability be excluded as donors for most of the escapees recaptured in the area.

Keywords: assignment, Atlantic salmon, escapees, farm, microsatellite, Salmo salar

Received 24 July 2007; accepted 17 March 2008; advance access publication 21 April 2008.


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