Individual quotas, fishing effort allocation, and over-quota discarding in mixed fisheries. Poos, J. J., Bogaards, J. A., Quirijns, F. J., Gillis, D. M., & Rijnsdorp, A. D. ICES JOURNAL OF MARINE SCIENCE, 67(2):323-333, OXFORD UNIV PRESS, GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND, MAR, 2010.
doi  abstract   bibtex   
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.
@article{ ISI:000274341200013,
Author = {Poos, J. J. and Bogaards, J. A. and Quirijns, F. J. and Gillis, D. M.
   and Rijnsdorp, A. D.},
Title = {{Individual quotas, fishing effort allocation, and over-quota discarding
   in mixed fisheries}},
Journal = {{ICES JOURNAL OF MARINE SCIENCE}},
Year = {{2010}},
Volume = {{67}},
Number = {{2}},
Pages = {{323-333}},
Month = {{MAR}},
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.}},
Publisher = {{OXFORD UNIV PRESS}},
Address = {{GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Poos, JJ (Reprint Author), Inst Marine Resources \& Ecosyst Studies, Wageningen IMARES, POB 68, NL-1970 AB Ijmuiden, Netherlands.
   Poos, J. J.; Bogaards, J. A.; Quirijns, F. J.; Rijnsdorp, A. D., Inst Marine Resources \& Ecosyst Studies, Wageningen IMARES, NL-1970 AB Ijmuiden, Netherlands.
   Gillis, D. M., Univ Manitoba, Dept Biol Sci, Winnipeg, MB R3T 2N2, Canada.
   Rijnsdorp, A. D., Univ Wageningen, Aquaculture \& Fisheries Grp, NL-6700 AH Wageningen, Netherlands.}},
DOI = {{10.1093/icesjms/fsp241}},
ISSN = {{1054-3139}},
EISSN = {{1095-9289}},
Keywords = {{behavioural responses; dynamic-state variable modelling; fishing effort;
   fleet dynamics; quota regulations}},
Keywords-Plus = {{NORTH-SEA PLAICE; MULTISPECIES TRAWL FISHERY; PLEURONECTES-PLATESSA L;
   TRANSFERABLE QUOTAS; FLEET DYNAMICS; BEAM TRAWLERS; TAGGING DATA;
   MANAGEMENT; FLATFISH; MOVEMENT}},
Research-Areas = {{Fisheries; Marine \& Freshwater Biology; Oceanography}},
Web-of-Science-Categories  = {{Fisheries; Marine \& Freshwater Biology; Oceanography}},
Author-Email = {{janjaap.poos@wur.nl}},
ResearcherID-Numbers = {{Rijnsdorp, Adriaan/A-4217-2008
   Poos, Jan Jaap/B-9940-2009}},
ORCID-Numbers = {{Rijnsdorp, Adriaan/0000-0003-0785-9662
   Poos, Jan Jaap/0000-0002-8507-5751}},
Funding-Acknowledgement = {{NCF {[}NRG-2002.01]; NWO {[}ALW88510104]; EU {[}SSP8 022644,]; Capacity,
   F and Effort (CAFE); NSERC}},
Funding-Text = {{We thank Willem Vermin for analysis of the original C++ code and adding
   the OpenMP paradigm, funded by NCF grant NRG-2002.01, the skippers that
   contributed to the F-project for the invaluable information they
   provided in voluntary electronic logbooks, and the anonymous referees
   for their constructive comments. The study was supported by NWO grant
   ALW88510104 to JJP and funding from the EU project SSP8 022644,
   Capacity, F and Effort (CAFE) to JAB, and an NSERC Discovery Grant to
   DMG.}},
Number-of-Cited-References = {{59}},
Times-Cited = {{52}},
Usage-Count-Last-180-days = {{0}},
Usage-Count-Since-2013 = {{22}},
Journal-ISO = {{ICES J. Mar. Sci.}},
Doc-Delivery-Number = {{553CB}},
Unique-ID = {{ISI:000274341200013}},
OA = {{No}},
DA = {{2017-08-17}},
}
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