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 498180
Title High-grading and over-quota discarding in mixed fisheries
Author(s) Batsleer, J.; Hamon, K.G.; Overzee, H.M.J. van; Rijnsdorp, A.D.; Poos, J.J.
Source Reviews in Fish Biology and Fisheries 25 (2015)4. - ISSN 0960-3166 - p. 715 - 736.
DOI https://doi.org/10.1007/s11160-015-9403-0
Department(s) IMARES Visserij
IMARES
LEI Performance and Impact Agrosectors
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) By-catch - Common fisheries policy - Discards - Fisheries management - Flatfish
Abstract

High-grading is the decision by fishers to discard fish of low value that allows them to land more valuable fish. A literature review showed high-grading is reported in commercial and non-commercial fisheries around the world, although the number of observations is small. High-grading occurs in fisheries that are restricted to land their total catch due to management, market or physical constraints. Using the mixed flatfish fishery as a model system, a dynamic state variable model simulation showed that high-grading of certain grades occurs throughout the year when their ex-vessel price is low. High-grading increases with the degree of quota restriction, while the level of over-quota discarding is unrelated to the quota level. The size composition of the high-graded catch differs from the landed catch. Due to the differences in the seasonal variation in size specific ex-vessel price, the effect of quota restrictions on the size composition of the discarded catch is non-linear. High-grading is difficult to detect for the fishery inspection as it occurs on-board during the short period when the catch is processed. We conclude that high-grading is under-reported in fish stocks managed by restrictive quota, undermining the quality of stock assessments and sustainable management of exploited fish stocks.

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