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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on October 29, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp241
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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

Individual quotas, fishing effort allocation, and over-quota discarding in mixed fisheries

J. J. Poos1, J. A. Bogaards1, F. J. Quirijns1, D. M. Gillis2 and A. D. Rijnsdorp1,3

1 Wageningen IMARES, Institute for Marine Resources and Ecosystem Studies, PO Box 68, 1970 AB IJmuiden, The Netherlands
2 Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
3 Aquaculture and Fisheries group, University of Wageningen, PO Box 338, 6700 AH Wageningen, The Netherlands

Correspondence to J. J. Poos: tel: +31 317 487189; fax: +31 317 487326; e-mail: janjaap.poos{at}wur.nl.

Poos, J. J., Bogaards, J. A., Quirijns, F. J., Gillis, D. M., and Rijnsdorp, A. D. 2010. Individual quotas, fishing effort allocation, and over-quota discarding in mixed fisheries. – ICES Journal of Marine Science, 67: 000–000.

Many fisheries are managed by total allowable catches (TACs) and a substantial part by individual quotas. Such output management has not been successful in mixed fisheries when fishers continue to fish while discarding marketable fish. We analyse the effects of individual quotas on spatial and temporal effort allocation and over-quota discarding in a multispecies fishery. Using a spatially explicit dynamic-state variable model, the optimal fishing strategy of fishers constrained by annual individual quotas, facing uncertainty in catch rates, is studied. Individual fishers will move away from areas with high catches of the restricted quota species and, depending on the cost of fishing, will stop fishing in certain periods of the year. Individual vessels will discard marketable fish, but only after their individual quota for the species under consideration has been reached. These results are in line with observations on effort allocation and discarding of marketable fish, both over-quota discarding and highgrading, by the Dutch beam-trawl fleet. The models we present can be used to predict the outcomes of management and are therefore a useful tool for fisheries scientists and managers.

Keywords: behavioural responses, dynamic-state variable modelling, fishing effort, fleet dynamics, quota regulations

Received 13 January 2009; accepted 27 August 2009.


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