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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on June 19, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(9):1959-1966; doi:10.1093/icesjms/fsp165
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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

Using stock assessment information to assess fishing capacity of tuna fisheries

Haritz Arrizabalaga1, Victor R. Restrepo2, Mark N. Maunder3 and Jacek Majkowski4

1 AZTI Tecnalia, Marine Research Division, Herrera Kaia Portualdea z/g, 20110 Pasaia (Gipuzkoa), Spain
2 International Commission for the Conservation of Atlantic Tunas (ICCAT), Corazón de María 8, 28002 Madrid, Spain
3 Inter-American Tropical Tuna Commission (IATTC), 8604 La Jolla Shores Drive, La Jolla, CA 92037-1508, USA
4 Fisheries Management and Conservation Service (FIMF), Fisheries and Aquaculture Management Division (FIM), Fisheries and Aquaculture Department (FI), FAO, Via delle Terme di Caracalla, 00153 Rome, Italy

Correspondence to H. Arrizabalaga: tel: +34 943 004800; fax: +34 946 572555; e-mail: harri{at}azti.es

Arrizabalaga, H., Restrepo, V. R., Maunder, M. N., and Majkowski, J. 2009. Using stock assessment information to assess fishing capacity of tuna fisheries. – ICES Journal of Marine Science, 66: 1959–1966.

In tuna and tuna-like fisheries, there is a need for periodic assessments of fishing capacity to aid management. However, the nature and quantity of data needed to apply conventional methodologies for estimating fishing capacity are not usually available for tuna fisheries. We discuss simple alternative approaches to estimate fishing capacity and related quantities (i.e. capacity utilization, excess capacity, and overcapacity) directly from stock assessment inputs and outputs that are usually available for most tuna (and many other) stocks. Sensitivity analyses are performed to assess the effect of different levels of data aggregation and different assumptions made during the stock assessments on estimates of fishing capacity. Main advantages and disadvantages of the proposed methodologies are also illustrated using stock assessment information from different tuna stocks with different historical developments and trends in fishing mortality.

Keywords: capacity estimation, fishing capacity, stock assessment, tuna fisheries

Received 18 July 2008; accepted 23 April 2009; advance access publication 19 June 2009.


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