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Conservation restocking of the imperilled European eel does not necessarily equal conservation

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dc.contributor.authorRohtla, Mehis
dc.contributor.authorSilm, Maidu
dc.contributor.authorTulonen, Jouni
dc.contributor.authorPaiste, Päärn
dc.contributor.authorWickström, Hakan
dc.contributor.authorKielman-Schmitt, Melanie
dc.contributor.authorKooijman, Ellen
dc.contributor.authorVaino, Väino
dc.contributor.authorEschbaum, Redik
dc.contributor.authorSaks, Lauri
dc.contributor.authorVerliin, Aare
dc.contributor.authorVetemaa, Markus
dc.contributor.departmentInstitute of Agricultural and Environmental Sciences, Centre for Limnologyeng
dc.date.accessioned2023-03-17T13:03:39Z
dc.date.available2023-03-17T13:03:39Z
dc.date.issued2021
dc.description.abstractTo stop the decline of the European eel population, one of the measures taken is translocating eels for restocking, despite its conservational value being largely unknown. We aimed to contribute to this knowledge gap by (i) investigating the origin of eels caught in coastal waters of Estonia and Finland using otolith microchemistry and (ii) directly estimating restocked eel escapement from Narva River Basin District (NRBD), which is part of the primary Eel Management Unit in Estonia. In Estonia, 74% of the sampled eels (n ¼ 140) were natural recruits and 26% were restocked. In Finland, 27% of the sampled eels (n ¼ 235) were natural recruits and 73% were restocked. Only 1% of all the coastally collected eels were originally restocked to NRBD. These new data together with the reported commercial landings from the escapement route conflict with the current silver eel escapement estimation for NRBD and question the accuracy and value of such indirect calculations com- piled for most Eel Management Units throughout the European Union. It is concluded that restocking eels to freshwaters may be futile as a conservation measure in some situations, and better escapement is likely achieved in restocking eels to coastal waters or undammed freshwa- ter systems with a direct connection to the sea.eng
dc.description.abstractThis is Vegacenter publication no. 033. M.R. received financial support from the Norwegian Research Council (project MAREEL #280658). We thank all the people who participated in sample collection. We also thank two anonymous reviewers for their con- structive comments on the manuscript.eng
dc.description.sponsorshipThis is Vegacenter publication no. 033. M.R. received financial support from the Norwegian Research Council (project MAREEL #280658). We thank all the people who participated in sample collection. We also thank two anonymous reviewers for their con- structive comments on the manuscript.eng
dc.identifier.issn1095-9289
dc.identifier.publicationICES Journal of Marine Science (2021), 78(1), 101–111.eng
dc.identifier.urihttp://hdl.handle.net/10492/8001
dc.identifier.urihttps://dx.doi.org/10.1093/icesjms/fsaa196
dc.publisherOxford University Presseng
dc.rights© International Council for the Exploration of the Sea 2020. All rights reservedeng
dc.subjectAnguilla anguillalat
dc.subjecteel management planeng
dc.subjectmigrationeng
dc.subjectotolith microchemistryeng
dc.subjectprovenanceeng
dc.subjectarticleseng
dc.titleConservation restocking of the imperilled European eel does not necessarily equal conservationeng
dc.typeArticleeng

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