Dynamic ecological-economic modelling was used to conduct a comprehensive analysis of the economic impacts of the American mink (Mustela vison) on a marketable, exploitable, native species Salmon (Salmo salar) reared in fish farms in the Western Isles. A cost–benefit analysis of the different mink control options, including a ‘doing nothing’ option as a baseline, was conducted. Biological and economic data as well as the assumptions used in the simulations are based on scientific literature and from a 5-year mink control project on the Western Isles. Results suggest mink eradication as the best long-term strategy for an isolated fish farm being affected by predation. However, ‘doing nothing’ would be the best option if average market prices for farmed salmon are low over a long period of time and/or the pest control manager overestimates the area being impacted by mink.
control, cost–benefit analysis, farmed salmon, mink, simulation modelling
 Atkinson, IAE., Introductions of wildlife as a cause of species extinctions. Wildlife Biology, 2, pp. 135–141, 1996.
 Vitousek, P.M., D’Antonio, C.M., Loope, L.L., Rejmanek, M. & Westbrooks, R., Introduced species: a signifi cant component of human-caused global change. New Zealand Journal of Ecology, 21, pp. 1–16, 1997.
 Perrings, C., Williamson, M., Barbier, E.B., Delfi no, D., Dalmazzone, S., Shogren, J., Simmons, P. & Watkinson, A., Biological invasion risks and the public good: an economic perspective. Conservation Ecology, 6(1): art. no 1, 2002.
 Shogren, J.F. & Tschirhart, J., Integrating ecology and economics to address bioinvasions. Ecological Economics, 52(3), pp. 267–271, 2005.
 VanVuren, D. & Smallwood, K.W., Ecological management of vertebrate pests in agricultural systems. Biological Agriculture and Horticulture, 13, pp. 39–62, 1996.
 Mumford, J.D. & Norton, G.A., Economics of decision making in pest management. Annual Review of Entomology, 29, pp. 157–174, 1984.
 Baxter, P.W.J., Sabo, J.L., Wilcox, C., McCarthy, M.A., & Possingham, H.P., Cost-effective suppression and eradication of invasive predators. Conservation Biology, 22, pp. 89–98, 2008.
 Bicknell, K., Cost–benefi t and cost-effectiveness analyses in pest-management. New Zealand Journal of Zoology, 20, pp. 307–312, 1993.
 Moberly, R.L., White, P.C.L., Webbon, C.C., Baker, P.J., & Harris, S., Modelling costs of fox predation and preventative measures on sheep farms in Britain. Journal of Environmental Management, 70, pp. 129–143, 2004.
 Frederiksen, M., Lebreton, J.D., & Bregnballe, T., The interplay between culling and densitydependence in the great cormorant: a modelling approach. Journal of Applied Ecology, 38, pp. 617–627, 2001.
 Western Isles Fisheries Trust, Biennial Report, 1999.
 Edwards, T. & Cook, G., Aquaculture, The Scottish Parliament, Research Note RN 01/103, 2001.
 Cuthbert, J.H., The origin and distribution of feral mink in Scotland. Mammal Review, 3, pp. 97–103, 1973.
 Angus, S., A proposed mink control programme. Hebridean Naturalist, 11, pp. 78–84, 1992.
 Moore, N.P., Roy, S.S. & Heylar, A., Mink eradication project ground nesting birds in the Western Isles, Scotland, UK. New Zealand Journal of Zoology, 30, pp. 443–452, 2003.
 Bonesi, L., Harrington, L.A., Maran, T., Sidorovich, V.E. & Macdonald, D.W., Demography of three populations of American mink, Mustela vison, in Europe. Mammal Review, 1, pp. 98–106, 2006.
 Helyar, A.F., The ecology of American mink (Mustela vison); response to control, PhD Thesis, Department of Biology, University of York, 2005.
 Dunstone, N., The Mink.T. and A.D. Poyser Limited: London, 235 pp., 1993.
 Akande, M., The food of feral mink (Mustela vison) in Scotland. Journal of Zoology, 167, pp. 475–479, 1972.
 Day M.G. & Linn I., Notes on the food of feral mink Mustela vison in England and Wales. Journal of Zoology, 167, pp. 463-473, 1972.
 Arnold, T.W. & Fritzell, E.K., Food habits of prairie mink during the waterfowl breeding season. Canadian Journal of Zoology, 65, pp. 2322–2324, 1987.
 Strachan, C. & Jefferies, D.J., An assessment of the diet of feral American mink Mustela vison from scats collected in areas where water voles Arvicola terrestris occur. Naturalist 121, pp. 73–81, 1996.
 Ferreras, P. & Macdonald, D.W., 1999. The impact of American mink Mustela vison on water birds in the Upper Thames. Journal of Applied Ecology, 36, pp. 701–708, 1999.
 Macdonald, D.W. & Strachan, R., The Mink and the Water Vole: Analyses for Conservation, George Street Press: Stafford, 1999.
 Macdonald, D.W., Sidorovich, V.E., Anisomova, N.V., Sidorovich, N.V. & Johnson, P.J., The impact of American mink Mustela vison and European mink Mustela lutreola on water voles Arvicola terrestris in Belarus. Ecography, 25, pp. 295–302, 2002.
 Bartoszewicz, M. & Zalewski, A., American mink, Mustela vison, diet and predation on waterfowl in the Slonsk Reserve, western Poland. Folia Zoologica, 52, pp. 225–238, 2003.
 Gerell, R., Food selection in relation to habitat in mink (Mustela vison Schreber) in Sweden. Oikos, 18, pp. 233–246, 1967.
 Heggenes, J. & Borgstrom, R., Effect of mink, Mustela vison Schreber, predation on cohorts of juvenile Atlantic salmon, Salmo salar L., and brown trout S. trutta L., in three small streams. Journal of Fish Biology, 33, pp. 885–894, 1988.
 Moore, N.P., Robertson, P.A. & Aegerter, J.N., Feasibility Study into the Options for Management of Mink in the Western Isles, Internal Report for Scottish Natural Heritage, 2000.
 Roy, S.S., Mink control to protect important birds in SPAs in the Western Isles. Final Report to EU LIFE III–Nature, 2006.
 Moore, B., Boyns, N., Tilley, H. & Bostcok, J., The economic impact of Scottish salmon farming, Economic Research Paper, Number 7, The Scottish Offi ce, 1999.
 Roberts, D., Thomson, K.J. & Snowdon, P., Modelling the Western Isles Economy: Regional Accounts 1997, Final report, Macaulay Land Use Research Institute with the University of Aberdeen, 1999.
 Willoughby, S., Manual of Salmonid Farming. Blackwell Science: Berlin, Germany, 1999.
 Clode, D., Haliwell, E.C. & MacDonald, D.W., A comparison of body condition in riverine and coastal mink (Mustela vison). Journal of Zoology, 237, pp. 686–689, 1995.
 Lindstrom, J.W. & Hubert, W.A., Mink predation on radio-tagged trout during winter in a low-gradient reach of a mountain stream, Wyoming. Western North American Naturalist, 64, pp. 551–553, 2004.
 Roy, S., Macleod, I. & Moore, N., The use of scent glands to improve the effi ciency of mink Mustela vison captures in the Outer Hebrides. New Zealand Journal of Zoology, 33, pp. 267–271, 2006.
 Clode, D. & MacDonald, D.W., Invasive predators and the conservation of island birds: the case of American Mink Mustela vison and terns Sterna spp. in the Western Isles, Scotland. Bird Study, 49, pp. 118–123, 2002.
 Nordstrom, M. & Korpimaki, E., Effects of island isolation and feral mink removal on bird communities on small islands in the Baltic Sea. Journal of Animal Ecology, 73(3), pp. 424–433, 2004.
 Nordstrom, M., Laine, J., Ahona, M. & Korpimaki, E., Reduced nest defence intensity and improved breeding success in terns as responses to removal of non-native American mink. Behavioural Ecology and Sociobiology, 55(5), pp. 454–460, 2004.