An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers
Restocking of the critically endangered European eel Anguilla anguilla is widespread, but it is rarely scientifically evaluated. Methods used to assess its associated performance by estimating the survival rate and implement restocking for maximum recruitment in rivers have not yet been investigated...
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ftmdpi:oai:mdpi.com:/2071-1050/12/3/1124/ 2023-08-20T03:59:44+02:00 An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers Billy Nzau Matondo Jean-Philippe Benitez Arnaud Dierckx Xavier Rollin Michaël Ovidio agris 2020-02-05 application/pdf https://doi.org/10.3390/su12031124 EN eng Multidisciplinary Digital Publishing Institute Environmental Sustainability and Applications https://dx.doi.org/10.3390/su12031124 https://creativecommons.org/licenses/by/4.0/ Sustainability; Volume 12; Issue 3; Pages: 1124 stock assessment capture-mark-recapture RFID telemetry restocking juvenile European eel Text 2020 ftmdpi https://doi.org/10.3390/su12031124 2023-07-31T23:04:40Z Restocking of the critically endangered European eel Anguilla anguilla is widespread, but it is rarely scientifically evaluated. Methods used to assess its associated performance by estimating the survival rate and implement restocking for maximum recruitment in rivers have not yet been investigated. Based on two glass eel restocking events using a single release site/point and multiple sites per river performed in upland rivers (>340 km from the North Sea), the recruitment success of stocked eels was scientifically evaluated during a 3-year study using multiple capture-mark-recapture methods and mobile telemetry. We compared the observed data with the data estimated from the Telemetry, De Lury and Jolly-Seber stock assessment methods. For recruitment data, Telemetry was very close to Jolly-Seber, an appropriate stock assessment method for open populations. Using the best model of Jolly-Seber, survival probability was higher (>95%) in both restocking practices, but recruitment yields were higher and densities of stocked eels were lower in multiple sites compared to a single site. Our results suggest that Telemetry can help to rapidly assess cryptic juvenile eel stocks with good accuracy under a limited number of capture-mark-recapture sessions. Artificial dispersal of glass eels on several productive habitats/sites per river appears to be the better-suited practice for restocking. Text Anguilla anguilla MDPI Open Access Publishing Sustainability 12 3 1124 |
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stock assessment capture-mark-recapture RFID telemetry restocking juvenile European eel |
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stock assessment capture-mark-recapture RFID telemetry restocking juvenile European eel Billy Nzau Matondo Jean-Philippe Benitez Arnaud Dierckx Xavier Rollin Michaël Ovidio An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
topic_facet |
stock assessment capture-mark-recapture RFID telemetry restocking juvenile European eel |
description |
Restocking of the critically endangered European eel Anguilla anguilla is widespread, but it is rarely scientifically evaluated. Methods used to assess its associated performance by estimating the survival rate and implement restocking for maximum recruitment in rivers have not yet been investigated. Based on two glass eel restocking events using a single release site/point and multiple sites per river performed in upland rivers (>340 km from the North Sea), the recruitment success of stocked eels was scientifically evaluated during a 3-year study using multiple capture-mark-recapture methods and mobile telemetry. We compared the observed data with the data estimated from the Telemetry, De Lury and Jolly-Seber stock assessment methods. For recruitment data, Telemetry was very close to Jolly-Seber, an appropriate stock assessment method for open populations. Using the best model of Jolly-Seber, survival probability was higher (>95%) in both restocking practices, but recruitment yields were higher and densities of stocked eels were lower in multiple sites compared to a single site. Our results suggest that Telemetry can help to rapidly assess cryptic juvenile eel stocks with good accuracy under a limited number of capture-mark-recapture sessions. Artificial dispersal of glass eels on several productive habitats/sites per river appears to be the better-suited practice for restocking. |
format |
Text |
author |
Billy Nzau Matondo Jean-Philippe Benitez Arnaud Dierckx Xavier Rollin Michaël Ovidio |
author_facet |
Billy Nzau Matondo Jean-Philippe Benitez Arnaud Dierckx Xavier Rollin Michaël Ovidio |
author_sort |
Billy Nzau Matondo |
title |
An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
title_short |
An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
title_full |
An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
title_fullStr |
An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
title_full_unstemmed |
An Evaluation of Restocking Practice and Demographic Stock Assessment Methods for Cryptic Juvenile European Eel in Upland Rivers |
title_sort |
evaluation of restocking practice and demographic stock assessment methods for cryptic juvenile european eel in upland rivers |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2020 |
url |
https://doi.org/10.3390/su12031124 |
op_coverage |
agris |
genre |
Anguilla anguilla |
genre_facet |
Anguilla anguilla |
op_source |
Sustainability; Volume 12; Issue 3; Pages: 1124 |
op_relation |
Environmental Sustainability and Applications https://dx.doi.org/10.3390/su12031124 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/su12031124 |
container_title |
Sustainability |
container_volume |
12 |
container_issue |
3 |
container_start_page |
1124 |
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1774715072634945536 |