A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands
Given the poor status of the European eel (Anguilla anguilla) population, good assessments are essential to optimise recovery measures. Quantifying eel stock size is challenging given the fractal nature of the distribution of eels, particularly in The Netherlands with its dense interconnected networ...
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ftunivwagenin:oai:library.wur.nl:wurpubs/447755 2024-02-04T09:52:55+01:00 A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands van de Wolfshaar, K.E. Tien, N.S.H. Winter, H.V. de Graaf, M. Bierman, S.M. 2014 application/pdf https://research.wur.nl/en/publications/a-spatial-assessment-model-for-european-eel-anguilla-anguilla-in- https://doi.org/10.1051/kmae/2013083 en eng https://edepot.wur.nl/287954 https://research.wur.nl/en/publications/a-spatial-assessment-model-for-european-eel-anguilla-anguilla-in- doi:10.1051/kmae/2013083 info:eu-repo/semantics/openAccess Wageningen University & Research Knowledge and Management of Aquatic Ecosystems (2014) 412 ISSN: 1961-9502 connectivity stock info:eu-repo/semantics/article Article/Letter to editor info:eu-repo/semantics/publishedVersion 2014 ftunivwagenin https://doi.org/10.1051/kmae/2013083 2024-01-10T23:20:05Z Given the poor status of the European eel (Anguilla anguilla) population, good assessments are essential to optimise recovery measures. Quantifying eel stock size is challenging given the fractal nature of the distribution of eels, particularly in The Netherlands with its dense interconnected network of drainage ditches, rivers and lakes. Dynamic demographic models as used by others are inappropriate in this delta with a demand for regional information on stock size. We therefore estimated the standing eel stock biomass for all freshwater water bodies, using fish monitoring data collected under the Water Framework Directive and a static GIS approach. Density data were extrapolated to total biomass estimates using GIS data concerning water type, surface area and bank length, and biological parameters obtained from biological data. The analysis yielded density and biomass estimates of the total eel and silver eel stock, with most silver eel biomass being confined to a few coastal regions. The main conclusion is that over half of the Dutch eel biomass is found in the small, regionally managed waters, revealing a crude underestimation of the eel biomass in the 2009 Dutch Eel Management Plan. The silver eel biomass estimate presented here is two to three times higher than previous estimates. Providing spatial information on eel biomass will aid in prioritising management measures to reduce anthropogenic mortality. Article in Journal/Newspaper Anguilla anguilla Wageningen UR (University & Research Centre): Digital Library Knowledge and Management of Aquatic Ecosystems 412 02 |
institution |
Open Polar |
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Wageningen UR (University & Research Centre): Digital Library |
op_collection_id |
ftunivwagenin |
language |
English |
topic |
connectivity stock |
spellingShingle |
connectivity stock van de Wolfshaar, K.E. Tien, N.S.H. Winter, H.V. de Graaf, M. Bierman, S.M. A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
topic_facet |
connectivity stock |
description |
Given the poor status of the European eel (Anguilla anguilla) population, good assessments are essential to optimise recovery measures. Quantifying eel stock size is challenging given the fractal nature of the distribution of eels, particularly in The Netherlands with its dense interconnected network of drainage ditches, rivers and lakes. Dynamic demographic models as used by others are inappropriate in this delta with a demand for regional information on stock size. We therefore estimated the standing eel stock biomass for all freshwater water bodies, using fish monitoring data collected under the Water Framework Directive and a static GIS approach. Density data were extrapolated to total biomass estimates using GIS data concerning water type, surface area and bank length, and biological parameters obtained from biological data. The analysis yielded density and biomass estimates of the total eel and silver eel stock, with most silver eel biomass being confined to a few coastal regions. The main conclusion is that over half of the Dutch eel biomass is found in the small, regionally managed waters, revealing a crude underestimation of the eel biomass in the 2009 Dutch Eel Management Plan. The silver eel biomass estimate presented here is two to three times higher than previous estimates. Providing spatial information on eel biomass will aid in prioritising management measures to reduce anthropogenic mortality. |
format |
Article in Journal/Newspaper |
author |
van de Wolfshaar, K.E. Tien, N.S.H. Winter, H.V. de Graaf, M. Bierman, S.M. |
author_facet |
van de Wolfshaar, K.E. Tien, N.S.H. Winter, H.V. de Graaf, M. Bierman, S.M. |
author_sort |
van de Wolfshaar, K.E. |
title |
A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
title_short |
A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
title_full |
A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
title_fullStr |
A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
title_full_unstemmed |
A spatial assessment model for European eel (Anguilla anguilla) in a delta, The Netherlands |
title_sort |
spatial assessment model for european eel (anguilla anguilla) in a delta, the netherlands |
publishDate |
2014 |
url |
https://research.wur.nl/en/publications/a-spatial-assessment-model-for-european-eel-anguilla-anguilla-in- https://doi.org/10.1051/kmae/2013083 |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Knowledge and Management of Aquatic Ecosystems (2014) 412 ISSN: 1961-9502 |
op_relation |
https://edepot.wur.nl/287954 https://research.wur.nl/en/publications/a-spatial-assessment-model-for-european-eel-anguilla-anguilla-in- doi:10.1051/kmae/2013083 |
op_rights |
info:eu-repo/semantics/openAccess Wageningen University & Research |
op_doi |
https://doi.org/10.1051/kmae/2013083 |
container_title |
Knowledge and Management of Aquatic Ecosystems |
container_issue |
412 |
container_start_page |
02 |
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1789962247805599744 |