Risks of regionalized stock assessments for widely distributed species like the panmictic European eel
In fisheries management, accurate stock assessment is pivotal to determine sustainable harvest levels or the scope of conservation measures. When assessment is decentralized and methods differ regionally, adopted approaches must be subjected to rigorous quality-checking, as biased assessments may mi...
Published in: | ICES Journal of Marine Science |
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Language: | English |
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Oxford University Press (OUP)
2024
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Online Access: | https://doi.org/10.1093/icesjms/fsae069 https://www.openagrar.de/receive/openagrar_mods_00097105 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00061153/dn068392.pdf |
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ftopenagrar:oai:www.openagrar.de:openagrar_mods_00097105 2024-09-15T18:05:14+00:00 Risks of regionalized stock assessments for widely distributed species like the panmictic European eel Höhne, Leander Briand, Cédric Freese, Marko Marohn, Lasse Pohlmann, Jan-Dag van der Hammen, Tessa Hanel, Reinhold 2024 https://doi.org/10.1093/icesjms/fsae069 https://www.openagrar.de/receive/openagrar_mods_00097105 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00061153/dn068392.pdf eng eng Oxford University Press (OUP) Oxford University Press ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsae069 https://www.openagrar.de/receive/openagrar_mods_00097105 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00061153/dn068392.pdf https://creativecommons.org/licenses/by/4.0/ public info:eu-repo/semantics/openAccess article Text ddc:630 Anguilla -- biomass target -- regionalized fisheries management -- diadromous fish -- model evaluation -- decentralized stock assessment article Text doc-type:article 2024 ftopenagrar https://doi.org/10.1093/icesjms/fsae069 2024-08-26T23:43:14Z In fisheries management, accurate stock assessment is pivotal to determine sustainable harvest levels or the scope of conservation measures. When assessment is decentralized and methods differ regionally, adopted approaches must be subjected to rigorous quality-checking, as biased assessments may mislead management decisions. To enable recovery of the critically endangered European eel, EU countries must fulfill a biomass target of potential spawner (“silver eel”) escapement, while local eel stock assessment approaches vary widely. We summarize local approaches and results of ground-truthing studies based on direct silver eel monitoring, to evaluate the accuracy of eel stock assessments in retrospect and identify bias sources. A substantial fraction of eel habitat is currently unassessed or assessed by unvalidated approaches. Across assessment models for which validation exists, demographic models frequently overestimated actual escapement, while misestimations of extrapolation (“spatial”) models were more balanced, slightly underestimating escapement. Stock size overestimation may lead to overexploitation or insufficient conservation measures, increasing the risk of stock collapse or slow recovery in coordinated frameworks. Underestimations may imply inefficient allocation of conservation efforts or negatively affect socioeconomy. Our work highlights the risks of regionalizing assessment responsibilities along with management decisions, calling for a common assessment toolbox and centralized quality-checking routines for eel. Article in Journal/Newspaper European eel OpenAgrar (OA) ICES Journal of Marine Science 81 6 1084 1095 |
institution |
Open Polar |
collection |
OpenAgrar (OA) |
op_collection_id |
ftopenagrar |
language |
English |
topic |
article Text ddc:630 Anguilla -- biomass target -- regionalized fisheries management -- diadromous fish -- model evaluation -- decentralized stock assessment |
spellingShingle |
article Text ddc:630 Anguilla -- biomass target -- regionalized fisheries management -- diadromous fish -- model evaluation -- decentralized stock assessment Höhne, Leander Briand, Cédric Freese, Marko Marohn, Lasse Pohlmann, Jan-Dag van der Hammen, Tessa Hanel, Reinhold Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
topic_facet |
article Text ddc:630 Anguilla -- biomass target -- regionalized fisheries management -- diadromous fish -- model evaluation -- decentralized stock assessment |
description |
In fisheries management, accurate stock assessment is pivotal to determine sustainable harvest levels or the scope of conservation measures. When assessment is decentralized and methods differ regionally, adopted approaches must be subjected to rigorous quality-checking, as biased assessments may mislead management decisions. To enable recovery of the critically endangered European eel, EU countries must fulfill a biomass target of potential spawner (“silver eel”) escapement, while local eel stock assessment approaches vary widely. We summarize local approaches and results of ground-truthing studies based on direct silver eel monitoring, to evaluate the accuracy of eel stock assessments in retrospect and identify bias sources. A substantial fraction of eel habitat is currently unassessed or assessed by unvalidated approaches. Across assessment models for which validation exists, demographic models frequently overestimated actual escapement, while misestimations of extrapolation (“spatial”) models were more balanced, slightly underestimating escapement. Stock size overestimation may lead to overexploitation or insufficient conservation measures, increasing the risk of stock collapse or slow recovery in coordinated frameworks. Underestimations may imply inefficient allocation of conservation efforts or negatively affect socioeconomy. Our work highlights the risks of regionalizing assessment responsibilities along with management decisions, calling for a common assessment toolbox and centralized quality-checking routines for eel. |
format |
Article in Journal/Newspaper |
author |
Höhne, Leander Briand, Cédric Freese, Marko Marohn, Lasse Pohlmann, Jan-Dag van der Hammen, Tessa Hanel, Reinhold |
author_facet |
Höhne, Leander Briand, Cédric Freese, Marko Marohn, Lasse Pohlmann, Jan-Dag van der Hammen, Tessa Hanel, Reinhold |
author_sort |
Höhne, Leander |
title |
Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
title_short |
Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
title_full |
Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
title_fullStr |
Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
title_full_unstemmed |
Risks of regionalized stock assessments for widely distributed species like the panmictic European eel |
title_sort |
risks of regionalized stock assessments for widely distributed species like the panmictic european eel |
publisher |
Oxford University Press (OUP) |
publishDate |
2024 |
url |
https://doi.org/10.1093/icesjms/fsae069 https://www.openagrar.de/receive/openagrar_mods_00097105 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00061153/dn068392.pdf |
genre |
European eel |
genre_facet |
European eel |
op_relation |
ICES journal of marine science : journal du Conseil -- ICES J Mar Sci -- 1054-3139 -- 29056-7 https://doi.org/10.1093/icesjms/fsae069 https://www.openagrar.de/receive/openagrar_mods_00097105 https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00061153/dn068392.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ public info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1093/icesjms/fsae069 |
container_title |
ICES Journal of Marine Science |
container_volume |
81 |
container_issue |
6 |
container_start_page |
1084 |
op_container_end_page |
1095 |
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1810442821911445504 |