Journal Article

Estimating and forecasting pre-fishery abundance of Atlantic salmon (<i>Salmo salar</i> L.) in the Northeast Atlantic for the management of mixed-stock fisheries

E.C.E. Potter, W.W. Crozier, P-J. Schön, M.D. Nicholson, D.L. Maxwell, E. Prévost, J. Erkinaro, G. Gudbergsson, L. Karlsson, L.P. Hansen, J.C. MacLean, N. Ó Maoiléidigh and S. Prusov

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 61, issue 8, pages 1359-1369
Published in print January 2004 | ISSN: 1054-3139
Published online January 2004 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2004.08.012
Estimating and forecasting pre-fishery abundance of Atlantic salmon (Salmo salar L.) in the Northeast Atlantic for the management of mixed-stock fisheries

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Most exploitation of Atlantic salmon (Salmo salar) is restricted to “homewater fisheries”, which operate close to or within the rivers of origin of the stocks, but two “distant-water fisheries” are permitted to operate off the west coast of Greenland and in the Norwegian Sea, and take salmon from a large number of rivers over a wide geographical area. Providing robust quantitative catch advice for these mixed-stock fisheries depends upon the ability to forecast stock abundance for about 2000 salmon river-stocks around the North Atlantic, more than 1500 of which are in Europe. A “run-reconstruction” model is presented for estimating the historic pre-fishery abundance (PFA) of salmon for countries or regions around the Northeast Atlantic, based upon catch data and estimates of non-reporting rates and exploitation rates. These estimates are then used to develop predictive models of PFA on the basis of estimates of the egg deposition, derived from the run-reconstruction model and various environmental data. Although the selected environmental indices correlated with the PFA of both southern and northern European stock complexes, the main statistical significance in the forecast models was provided by temporal trends in the PFA. Clearly, such a model is only tenable in the short term, and will be poor at predicting a major change in stock status. Alternative approaches, based upon juvenile production indices and including Bayesian techniques, are therefore being considered.

Keywords: Atlantic salmon; mixed-stock fisheries; stock assessment; stock forecasts

Journal Article.  7361 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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