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ICES Journal of Marine Science: Journal du Conseil 2001 58(1):331-341; doi:10.1006/jmsc.2000.1014
© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Estimation of marine exploitation rates on Atlantic salmon (Salmo salar L.) stocks in Newfoundland, Canada

J. B. Dempsona,, C. J. Schwarzb, D. G. Reddina, M. F. O'Connella, C. C. Mullinsa and C. E. Bourgeoisa

a Science Branch, Department of Fisheries and Oceans PO Box 5667, St John's, Newfoundland, Canada, A1C 5X1
b Department of Mathematics and Statistics, Simon Fraser University Burnaby, British Columbia

Correspondence to J. B. Dempson: tel: +1 709 7724475; fax: +1 709 772 3578; e-mail: dempsonb{at}dfo-mpo.gc.ca

Marine exploitation rates were estimated for nine Newfoundland Atlantic salmon (Salmo salar L.) populations, separately for small and large salmon size components. Estimates were derived using counts of salmon returning to fish counting facilities rather than from tagging studies and thus adjustments were not required to account for tag loss, handling or tagging mortality, or tag reporting rates. For all stocks combined, the overall marine exploitation rate during the period 1984–1991 averaged 45.3% (29.6–57.1%) on small salmon and 74.2% (57.7–83.7%) on large salmon. These estimates are considered minimum values. Concerns related to declining salmon abundance resulted in the closure of the Newfoundland commercial salmon fishery in 1992. Results are discussed in relation to previous estimates derived from tagging, and highlight the importance of accounting for marine exploitation when examining trends in salmon survival and return data even when commercial fisheries have been closed.

Keywords: Atlantic salmon, Salmo salar, marine exploitation, Newfoundland, fisheries

Received 21 August 1999; accepted 31 October 2000.


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