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

Type Article
Date 2007-05
Language English
Author(s) Trenkel VerenaORCID1, Rochet Marie-Joelle1, Mesnil Benoit1
Affiliation(s) 1 : IFREMER, Dept EMH, F-44311 Nantes 3, France.
Source ICES Journal of Marine Science (1054-3139) (Oxford university press), 2007-05 , Vol. 64 , N. 4 , P. 768-774
DOI 10.1093/icesjms/fsm006
WOS© Times Cited 36
Keyword(s) scientific advice, indicators, fisheries management
Abstract 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.
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