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 407159
Title Spatial dimension and exploitation dynamics of local fishing grounds by fishers targeting several flatfish species
Author(s) Rijnsdorp, A.D.; Poos, J.J.; Quirijns, F.J.
Source Canadian Journal of Fisheries and Aquatic Sciences 68 (2011)6. - ISSN 0706-652X - p. 1064 - 1076.
Department(s) IMARES Visserij
Aquaculture and Fisheries
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) marginal value theorem - individual transferable quotas - multispecies trawl fishery - ideal free distribution - north-sea - fleet dynamics - competitive interactions - marine ecosystems - effort allocation - tac management
Abstract Patch exploitation dynamics, based on individual tow data, provided new insights into the fishing behavior of mixed fisheries. Fishing grounds were determined and their geometry quantified based on the proximity of tow positions. Tows were classified as being part of either searching, sampling, or exploitation behavior based on the intertow distance. Fishers can detect patches of flatfish on a scale of 25 nautical miles2. Catch rate during exploitation was 24%–36% above the catch rate while searching, and decreased at a rate of 20%·day–1. Once a patch was found, exploitation occurred until the catch rate dropped below a threshold level. The optimal giving-up catch rate was estimated based on the observed search time, catch rate decline, and range of fishing ground quality. The observed giving-up catch rate was 6%–11% higher than predicted by the marginal value theorem. The discrepancy between the observed and predicted patch leaving decision was consistent with the bias expected in an individual transferable quota (ITQ) management system. Our results provide a basis for interpreting vessel monitoring system (VMS) data and studying the interaction among fishers and between fishers and their resources at the appropriate time and spatial scale
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