Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 407457
Title Individual quotas, fishing effort allocation, and over-quota discarding in mixed fisheries
Author(s) Poos, J.J.; Bogaards, J.A.; Quirijns, F.J.; Gillis, D.M.; Rijnsdorp, A.D.
Source ICES Journal of Marine Science 67 (2010)2. - ISSN 1054-3139 - p. 323 - 333.
DOI https://doi.org/10.1093/icesjms/fsp241
Department(s) IMARES Visserij
IMARES
Aquaculture and Fisheries
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) north-sea plaice - multispecies trawl fishery - pleuronectes-platessa l - transferable quotas - fleet dynamics - beam trawlers - tagging data - management - flatfish - movement
Abstract 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.
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