Aquat. Living Resour.
Volume 23, Number 1, January-March 2010
|Page(s)||77 - 94|
|Published online||17 March 2010|
Evaluating the performance of survey-based operational management procedures
Fisheries Group, Imperial College, Division of Biology, Silwood Park, Ascot SL5 7PY, UK
2 AZTI, Herrera Kaia, Portualdea z/g, 20110 Pasajes, Spain
3 IMARES, PO Box 68, Haringkade 1, 1970 AB, IJmuiden, The Netherlands
4 CEFAS, Pakefield road, NR33 OHT, Lowestoft, UK
Corresponding author: email@example.com
Accepted: 15 October 2009
The design and evaluation of survey-based management strategies is addressed in this article, using three case-study fisheries: North Sea herring, Bay of Biscay anchovy and North Sea cod, with a brief history and the main management issues with each fishery outlined. A range of operational management procedures for the case study stocks were designed and evaluated using trends that may be derived from survey indices (spawner biomass, year-class strength and total mortality) with an array of simple and more structured observation error regimes simulated. Model-free and model-based indicators of stock status were employed in the management procedures. On the basis of stochastic stock-specific simulations, we identified the following key determinants of successful management procedures: (i) adequate specification of the stock-recruit relationship (model structure, parameter estimates and variability), (ii) knowledge of the magnitude and structure of the variation in the survey indices, and (iii) explication of the particular management objectives, when assessing management performance. More conservative harvesting strategies are required to meet specified targets in the presence of increasing stochasticity, due to both process and observation error. It was seen that survey-based operational management procedures can perform well in the absence of commercial data, and can also inform aspects of survey design with respect to acceptable levels of error or bias in the surveys.
Key words: FLR fishery simulation system / Management strategy evaluation / Fish survey / Fishery-independent data / Herring / Anchovy / Cod / North Sea / Biscay
© EDP Sciences, IFREMER, IRD, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.