{"datasetrec":{"DasID":6291,"Acronym":"ESGL","StandardTitle":"Migration behavior and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand-Lieu Lake, France)","OrigTitle":null,"OrigTitleLangID":null,"OrigTitleLangCode":null,"OrigTitleLang":null,"OrigTitleLangNL":null,"VersionName":null,"ContactEmail":null,"VersionDate":null,"VersionDay":null,"VersionMonth":null,"VersionYear":null,"SizeReference":null,"EngAbstract":"

Current knowledge about the downstream migration of sexually mature European eels (Anguilla anguilla) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is important to understand migration dynamics, and contribution to the breeding stock. This study aimed to assess the parameters that trigger and guide the migration of silver eels in the largest floodplain lake and associated wetlands in France (the sluice regulated Grand-Lieu Lake). A telemetry survey of 50 acoustic and PIT-tagged female silver eels was performed during the 2015–2016 migration period. We deployed a novel telemetric approach, using receivers to delimit several restricted virtual boxes to determine the instantaneous location of individuals and to transform simple discrete telemetric data into presence/absence data. The low numbers leaving the lake centre are probably explained by the lack of orienting water flows or other environmental clues, but whilst the fate of 34% (17/50) of the tagged eels is unknown, 18% (9/50) were caught by commercial fishermen. Modelling showed that detections were not clearly associated with environmental factors typically involved in riverine migrations (e.g. current velocity, atmospheric pressure and temperature) but they were particularly associated with higher and increasing water levels and, for eels exiting the lake, a sharp increase when sluice gates were opened to an effective gap of >75 cm. It is concluded that management of water levels and sluice gate opening during the migration period might aid escapement of silver eels.

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(2018) Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand-Lieu Lake, France)","AccessConstraints":null,"UDate":"2025-04-28","CDate":"2019-06-03","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-06-09 01:42:32.979540","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":1,"MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Research: field survey","Progress":"Completed","AccessConstraint":"Attribution (CC BY)","AccConstrEN":"Attribution (CC BY)","AccConstrDisplay":"\"Creative This dataset is licensed under a Creative Commons Attribution 4.0 International License.","License":"https://creativecommons.org/licenses/by/4.0/","AccConstrDescription":"This license lets others distribute, remix, tweak, and build upon your work, even commercially, as long as they credit you for the original creation. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials.","Lineage":null,"AccConID":21},"dois":null,"spcols":[{"SpColID":1000,"SpName":"European Tracking Network"}],"keywords":[{"ThesaurusTerm":"Acoustic data","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_54b338c3","Description":null,"OrigThesTerm":"Acoustic data","DutchTerm":null,"URI":"http://aims.fao.org/aos/agrovoc/c_54b338c3","DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic detection","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Acoustic detection","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic tags","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Acoustic tags","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic Tags","ThesTypID":30,"ThesType":"ETN Context","Code":null,"Description":"Tags that transmit acoustic signals","OrigThesTerm":"Acoustic Tags","DutchTerm":"Acoustic Tags","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic telemetry","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_3563933f","Description":null,"OrigThesTerm":"Acoustic telemetry","DutchTerm":null,"URI":"http://aims.fao.org/aos/agrovoc/c_3563933f","DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic Telemetry","ThesTypID":30,"ThesType":"ETN Context","Code":null,"Description":"Acoustic telemetry uses acoustic signals (also called ‘pings’) which propagate into the water, and are detected by acoustic receivers","OrigThesTerm":"Acoustic Telemetry","DutchTerm":"Akoestische Telemetrie","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic tracking","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Acoustic tracking","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Acoustic tracking","ThesTypID":4,"ThesType":"CAB Thesaurus","Code":"5296","Description":null,"OrigThesTerm":"Acoustic tracking","DutchTerm":null,"URI":"https://id.cabi.org/cabt/5296","DasKeywordDescr":null},{"ThesaurusTerm":"Animal Project","ThesTypID":30,"ThesType":"ETN Context","Code":null,"Description":"Project metadata related to animals and tags","OrigThesTerm":"Animal Project","DutchTerm":"Animal Project","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Catadromous fish","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Catadromous fish","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Catadromous migrations","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_1b5ddce2","Description":null,"OrigThesTerm":"Catadromous migrations","DutchTerm":null,"URI":"http://aims.fao.org/aos/agrovoc/c_1b5ddce2","DasKeywordDescr":null},{"ThesaurusTerm":"Catadromous migrations","ThesTypID":4,"ThesType":"CAB Thesaurus","Code":null,"Description":null,"OrigThesTerm":"Catadromous migrations","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Catadromous species","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Catadromous species","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Catadromous species","ThesTypID":4,"ThesType":"CAB Thesaurus","Code":null,"Description":null,"OrigThesTerm":"Catadromous species","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"European eels","ThesTypID":4,"ThesType":"CAB Thesaurus","Code":"46293","Description":null,"OrigThesTerm":"European eels","DutchTerm":null,"URI":"https://id.cabi.org/cabt/46293","DasKeywordDescr":null},{"ThesaurusTerm":"France, Pays de Loire, Grand-Lieu L.","ThesTypID":34,"ThesType":"ASFA Geoterms","Code":null,"Description":null,"OrigThesTerm":"France, Pays de Loire, Grand-Lieu L.","DutchTerm":null,"URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Network Project","ThesTypID":30,"ThesType":"ETN Context","Code":null,"Description":"Project metadata related to receivers and deployments","OrigThesTerm":"Network Project","DutchTerm":"Network Project","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Tracking","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":"c_c4d65583","Description":null,"OrigThesTerm":"Tracking","DutchTerm":"Tracking; 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