Journal Article

From model-based prescriptive advice to indicator-based interactive advice

Verena M. Trenkel, Marie-Joëlle Rochet and Benoît Mesnil

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 4, pages 768-774
Published in print May 2007 | ISSN: 1054-3139
Published online March 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm006
From model-based prescriptive advice to indicator-based interactive advice

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Trenkel, V. M., Rochet, M-J., and Mesnil, B. 2007. From model-based prescriptive advice to indicator-based interactive advice. – ICES Journal of Marine Science, 64: 768–774.

Traditional advice for fisheries management, especially in the ICES world, focuses on short-term stock projections relative to reference points. Primarily, two numbers, spawning-stock biomass and fishing mortality rate, are considered in the advice, although a range of biological processes are included in the stock assessment models. We propose an alternative form of final advice that would not rely on stock predictions and only two numbers, but on a suite of indicators that are combined to provide stock assessment and management advice. For a single stock, the approach consists of monitoring a set of indicators of population state and fishing pressure. Stock reference status at some time in the past is assessed, based on these indicators and/or other available information. Changes in indicator values after this reference time are then estimated, interpreted, and finally combined into a diagnostic that highlights possible causes of the changes observed. After considering management objectives, appropriate management actions can then be proposed. The proposed approach is illustrated for anglerfish stocks in the Celtic Sea and the Bay of Biscay.

Keywords: fisheries management; indicators; scientific advice

Journal Article.  4510 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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