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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on October 3, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp233
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Evaluating management strategies to implement the recovery plan for Iberian hake (Merluccius merluccius); the impact of censored catch information

Ernesto Jardim1, Santiago Cerviño2 and Manuela Azevedo1

1 IPIMAR – Instituto Nacional de Recursos Biológicos, Avenida Brasilia, 1449-006 Lisboa, Portugal
2 Instituto Español de Oceanografía, Cabo Estay-Canido, 36201 Vigo, Spain

Correspondence to E. Jardim: tel: +351 213 027 093; fax: +351 213 015 948; e-mail: ernesto{at}ipimar.pt.

Jardim, E., Cerviño, S., and Azevedo, M. 2010. Evaluating management strategies to implement the recovery plan for Iberian hake (Merluccius merluccius); the impact of censored catch information. – ICES Journal of Marine Science, 67: 000–000.

Iberian hake assessment revealed an increase in fishing mortality (F) despite enforcement of a recovery plan. Recent landings exceeded the total allowable catch and discarding rates were high. Alternative management strategies based on F control were evaluated with respect to the probability of recovering spawning-stock biomass (SSB), expected profits, and robustness to uncertainty on catch information and stock dynamics. Results showed that the use of censored catch data, i.e. excluding the Gulf of Cádiz or discards, may lead to inappropriate conclusions. Reducing fishing mortality was necessary for SSB to recover. An Fmax strategy with discard reduction showed the highest probability of rebuilding SSB and led the fishery to sustainable exploitation, with an expected %SPR of 30–40% in 2025, mean individual weight in the landings of 450 g in 2015, and yield increasing by >20%. Because of uncertainty in the estimates of maximum sustainable yield, management strategies based on FMSY were least robust, but all strategies were robust to alternative stock–recruit models.

Keywords: discards, Iberian hake, management strategy evaluation, operating model

Received 24 September 2008; accepted 10 July 2009.


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