{"datasetrec":{"DasID":5683,"Acronym":null,"StandardTitle":"Glasaalmigratie - Glass eel migration in the river Yser","OrigTitle":null,"OrigTitleLangID":null,"OrigTitleLangCode":null,"OrigTitleLang":null,"OrigTitleLangNL":null,"VersionName":"11.4","ContactEmail":null,"VersionDate":null,"VersionDay":31,"VersionMonth":5,"VersionYear":2022,"SizeReference":"1,171 records","EngAbstract":"The dataset contains data from glass eel that was captured with drag and lift nets during rising tide. This to study their distribution over the area. A fyke was used to investigate the influence of limited drainage opening during rising tide on elver migration.","EngDescr":"Geographic coverage: The river Yser, Flanders, Belgium. The Yser basin covers an area of 1101 km² and 32 km of the river is located in France and Belgium.The basin is known as an important area for European eel, providing valuable habitats for growth and development (Denayer & Belpaire 1996). The Yser is a river that originates in French Flanders (the north of France), enters the Belgian province of West Flanders and flows into the North Sea at the town of Nieuwpoort.\r\n
\r\nTaxonomic coverage: All records in this dataset are European eel (Anguilla anguilla).\r\n
\r\nStudy area description: European eel Anguilla anguilla (L.) populations have declined dramatically during the last decades and are now among the most critically endangered fish populations in Europe. The limitation of upstream migration of glass eels is considered to be one of the key factors reducing eel populations. The migration of eels in their juvenile stage (glass eels) was studied, and options to improve eel passage at a tidal barrier complex at the mouth of the Yser River, Flanders,Belgium, were assessed. Glass eels were sampled during tidal rise with stow nets and lift nets to analyse their distribution over the study area, while a fyke net was used to evaluate the impact of limited barrier opening on glass eel migration. Support-vector machine-based analysis of the lift net data indicated that migrating glass eels are attracted by the fresh water flow leaking from the barriers, whereas other variables such as the sampling location only had a weak influence on the glass eel density. Limited barrier opening during tidal rise appeared to be a cost-efficient and effective mitigation option to improve upstream glass eel migration without significant intrusion of seawater. Adjusted barrier management could often be implemented and applied on numerous tidal barriers. Therefore the results of this research are of interest to a wide range of river managers and stakeholders and may contribute to the conservation of many eel populations.\r\n
\r\nSampling methods: Glass eel were sampled during tidal rise with stow nets and lift nets to study their distribution over the study area, while a fyke net was used to evaluate the impact of limited barrier opening on glass eel migration.\r\n
\r\nPurpose: the presented data may contribute to restoration of eel populations worldwide and be of interest to a wide range of river managers and stakeholders.\r\n
\r\nThe publication of this dataset was supported by the INBO as part of the Flemish contribution to LifeWatch.","OrigAbstract":null,"OrigDescr":null,"Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":null,"EmbargoDate":null,"OrigDescrLangNL":null,"OrigLangCode":null,"OrigLangCodeExtended":null,"OrigLangID":null,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":"Mouton A (2022): Glasaalmigratie - Glass eel migration in the river Yser. v11.4. Research Institute for Nature and Forest (INBO). Dataset/Occurrence.","AccessConstraints":"To allow anyone to use this dataset, we have released the data to the public domain under a Creative Commons Zero waiver. We would appreciate however, if you read and follow these norms for data use and provide a link to the original dataset whenever possible. If you use these data for a scientific paper, please cite the dataset following the applicable citation norms and/or consider us for co-authorship. We are always interested to know how you have used or visualized the data, or to provide more information, so please contact us via the contact information provided in the metadata, opendata@inbo.be or https://twitter.com/LifeWatchINBO.","UDate":"2022-07-28","CDate":"2017-06-27","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-05-23 01:39:24.004480","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":1,"MarineFlag":0,"FreshFlag":1,"BrackishFlag":1,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Data collection","Progress":"Completed","AccessConstraint":"CC 0 (No Rights Reserved)","AccConstrEN":"CC 0 (No Rights Reserved)","AccConstrDisplay":"\"CC0\" To the extent possible under law, the person who associated CC0 with this dataset has waived all copyright and related or neighboring rights to this dataset.","License":"https://creativecommons.org/publicdomain/zero/1.0/","AccConstrDescription":"CC0 enables scientists, educators, artists and other creators and owners of copyright- or database-protected content to waive those interests in their works and thereby place them as completely as possible in the public domain, so that others may freely build upon, enhance and reuse the works for any purposes without restriction under copyright or database law.","Lineage":null,"AccConID":19,"DOI":"10.15468/cynpxv","GBIF_UUID":"67fa6403-d5c3-401b-b35d-ec70538ea41d"},"dois":null,"spcols":null,"keywords":[{"ThesaurusTerm":"Estuaries","ThesTypID":4,"ThesType":"CAB Thesaurus","Code":"45142","Description":null,"OrigThesTerm":"Estuaries","DutchTerm":"Estuaria","URI":"https://id.cabi.org/cabt/45142","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":"Migration","ThesTypID":3,"ThesType":"Transportation Research Thesaurus","Code":"Khbmn","Description":null,"OrigThesTerm":"Migration","DutchTerm":"Migratie","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Observation","ThesTypID":2,"ThesType":"CSA Technology Research Database Master Thesaurus","Code":null,"Description":null,"OrigThesTerm":"Observation","DutchTerm":"Observatie","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Tidal barriers","ThesTypID":1,"ThesType":"ASFA Thesaurus List","Code":null,"Description":null,"OrigThesTerm":"Tidal barriers","DutchTerm":"Stormvloedkeringen","URI":null,"DasKeywordDescr":null}],"parents":null,"children":null,"othrel":null,"othrelrev":null,"ownerships":[{"OrderNr":1,"Surname":"Mouton","Firstname":"Ans","Initials":"A.","PerPublicFlag":1,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"INBO","OrigNameLangCode":"en","OrigNameLangID":15,"FullOrigName":"Flemish Government; 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