{"datasetrec":{"DasID":3226,"Acronym":null,"StandardTitle":"Eel migration to the river Yser","OrigTitle":"Glasaalmigratie naar de rivier Ijzer","OrigTitleLangID":41,"OrigTitleLangCode":"nl","OrigTitleLang":"Dutch","OrigTitleLangNL":"Nederlands","VersionName":"1","ContactEmail":null,"VersionDate":null,"VersionDay":16,"VersionMonth":10,"VersionYear":2012,"SizeReference":"11071 records","EngAbstract":"The dataset contains data of glass eels 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.","EngDescr":"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 paper are of interest to a wide range of river managers and stakeholders and may contribute to the conservation of many eel populations.","OrigAbstract":"De dataset bevat gegevens van Glasaal die werd gevangen tijdens opkomend tij met sleep- en kruisnetten om hun verspreidingn over het studiegebied na te gaan, terwijl een fuik werd gebruikt om de invloed van beperkte spui-opening tijdens opkomend tij op glasaalmigratie na te gaan.","OrigDescr":"Reeds tientallen jaren wordt een sterke daling van de Europese aalpopulaties (Anguilla anguilla L.) waargenomen in Europa en de soort wordt nu zelfs beschouwd als één van de meest bedreigde Europese vissoorten. De beperking van de stroomopwaartse migratie van glasaal wordt nu algemeen beschouwd als één van de kritische factoren die de aalpopulaties in gevaar brengt. Eén van de belangrijkste intrekroutes voor glasaal in Vlaanderen betreft de IJzermonding. Daarom analyseert dit rapport glasaalmigratie en worden mogelijke mitigerende alternatieven geëvalueerd ter hoogte van de spuiconstructies in de Ganzepoot (IJzermonding) in Vlaanderen, België. Glasaal werd gevangen tijdens opkomend tij met sleep- en kruisnetten om hun verspreidingn over het studiegebied na te gaan, terwijl een fuik werd gebruikt om de invloed van beperkte spui-opening tijdens opkomend tij op glasaalmigratie na te gaan. Migrerende glasalen bereikten de spuien vermoedelijk tijdens een vorige tijcyclus, en er werd een densiteitspiek waargenomen in de tijstroom gedurende het laatste uur voor hoogtij. Support-vector machine analyse van de kruisnetdata toonde aan dat migrerende glasaal aangetrokken wordt door de zoetwaterstroom die lekt door de spuien, terwijl andere variabelen zoals de bemonsteringslocatie slechts een beperkt effect hadden op de glasaaldensiteit. Een artificiële lokstroom leidde niet tot significante veranderingen in de glasaaldensiteiten. Beperkte spui-opening gedurende het opkomend tij bleek een kostenefficiënte en effectieve mitigerende maatregel te zijn om stroomopwaartse glasaalmigratie te verbeteren, zonder significante instroom van zeewater. Aangezien dit aangepaste spuibeheer makkelijk kan geïmplementeerd worden en kan toegepast worden op talrijke gelijkaardige constructies, kunnen de resultaten in dit rapport bijdragen tot oplossingen voor het wereldwijd herstel van aalpopulaties en van belang zijn voor een groot aantal rivierbeheerders en stakeholders.","Comments":null,"ReleaseDate":null,"ReleaseDate0":null,"OrigDescrLang":"Dutch","EmbargoDate":null,"OrigDescrLangNL":"Nederlands","OrigLangCode":"nl","OrigLangCodeExtended":"dut","OrigLangID":41,"DescrCompFlag":0,"DescrTransFlag":0,"Citation":null,"AccessConstraints":null,"UDate":"2012-10-16","CDate":"2012-10-16","CurrencyDate":null,"RevisionDate":null,"DateLastModified":{"date":"2026-05-14 01:44:00.153333","timezone_type":1,"timezone":"+02:00"},"CheckedFlag":0,"PublicFlag":1,"VlizCoreFlag":0,"MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"StatusID":1,"DasType":"Data","DasTypeID":1,"DasOrigin":"Research: field survey","Progress":"Completed","AccessConstraint":"Restricted","AccConstrEN":"Restricted","AccConstrDisplay":null,"License":null,"AccConstrDescription":"The data are withheld from general circulation and disclosure but access may be obtained on a case-by-case basis through negotiation","Lineage":null,"AccConID":9},"dois":null,"spcols":null,"keywords":[{"ThesaurusTerm":"Glass eel","ThesTypID":0,"ThesType":null,"Code":null,"Description":null,"OrigThesTerm":"Glass eel","DutchTerm":"Glasaal","URI":null,"DasKeywordDescr":null},{"ThesaurusTerm":"Migration","ThesTypID":3,"ThesType":"Transportation Research Thesaurus","Code":"Khbmn","Description":null,"OrigThesTerm":"Migration","DutchTerm":"Migratie","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":145851,"Email":"ans.mouton@inbo.be","InsPublicFlag":1,"Acronym":null,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":1,"PersID":12005,"InsID":10444,"FullInstitute":"Vlaamse overheid; Beleidsdomein Omgeving; Instituut voor Natuur- en Bosonderzoek; Aquatisch Beheer","RoleID":24,"Role":"Contact","OrigName":null,"StandardName":"Aquatisch Beheer","FullAcronym":"LNE","ORC":null,"ROR":null},{"OrderNr":2,"Surname":null,"Firstname":null,"Initials":null,"PerPublicFlag":null,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"W&Z","OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"InsOwnerCNT":1,"PersID":null,"InsID":7129,"FullInstitute":"Vlaamse overheid; Beleidsdomein Mobiliteit en Openbare Werken; Waterwegen en zeekanaal NV","RoleID":20,"Role":"Data owner","OrigName":null,"StandardName":"Waterwegen en zeekanaal NV","FullAcronym":"MOW-W&Z","ORC":null,"ROR":null},{"OrderNr":3,"Surname":null,"Firstname":null,"Initials":null,"PerPublicFlag":null,"AdrID":null,"Email":null,"InsPublicFlag":1,"Acronym":"INBO","OrigNameLangCode":"en","OrigNameLangID":15,"FullOrigName":"Flemish Government; Policy Domain Environment; Research Institute for Nature and Forest","InsOwnerCNT":1,"PersID":null,"InsID":5443,"FullInstitute":"Vlaamse overheid; Beleidsdomein Omgeving; Instituut voor Natuur- en Bosonderzoek","RoleID":61,"Role":"Data creator","OrigName":"Research Institute for Nature and Forest","StandardName":"Instituut voor Natuur- en Bosonderzoek","FullAcronym":"LNE-INBO","ORC":null,"ROR":null}],"taxterms":[{"DasTaxtTypID":1,"DasTaxtType":"Taxonomic coverage","TaxtID":35982,"TaxTerm":"Anguilla anguilla","AphiaID":126281,"DutchTerm":"Paling"}],"frameworks":null,"otherterms":[{"OtherTerm":"Glass eel"}],"temporal":[{"DasDateID":2672,"StartYear":2009,"EndYear":2009,"StartDay":30,"EndDay":10,"StartDate":"2009-03-30","EndDate":"2009-04-10","DasDate":null,"Resolution":"Daily","ResolutionNL":"Dagelijks","Notes":null,"StartMonth0":3,"StartMonth":"March","StartMonthNL":"Maart","EndMonth0":4,"EndMonth":"April","EndMonthNL":"April","Progress":"Completed","ProgressNL":"Afgelopen"}],"geographical":[{"GeoTerm":"IJzer R.","DasGeoID":5913,"DasGeoTerm":null,"DasID":3226,"GeotID":6725,"X":null,"Y":null,"MaxX":null,"MaxY":null,"StationName":null,"Precision":null,"CoordSystID":null,"GeoDatumID":null,"OrigCoordMinX":null,"OrigCoordMinY":null,"OrigCoordMaxX":null,"OrigCoordMaxY":null,"OrderNr":null,"Projection":null,"GeoDatum":null,"GeoObjectID":3193,"OrigGeoTerm":"IJzer R.","DutchTerm":"IJzer"}],"meastypes":[{"MethID":null,"DasMeasTypID":8555,"DasMeasType":"vissen","Matrix":null,"MatrixNL":null,"Parameter":null,"ParameterNL":null,"Description":null,"Unit":null,"Methodology":null,"Protocol":null,"QualityControl":null,"Precision":null,"Detectionlimit":null,"Instrument":null,"InstrumentUrl":null,"MethFull":"","ParaCategoryTitle":null,"ParaCatCode":null},{"MethID":73,"DasMeasTypID":8554,"DasMeasType":"conductiviteit","Matrix":null,"MatrixNL":null,"Parameter":"Conductivity","ParameterNL":"Conductiviteit","Description":null,"Unit":"µS/cm","Methodology":"CTD","Protocol":1,"QualityControl":null,"Precision":null,"Detectionlimit":null,"Instrument":null,"InstrumentUrl":null,"MethFull":"CTD type: SBE-19 (www.seabird.com); depth profiles of temperature and salinity equipped with a OBS probe for relative turbidity measurements<br>","ParaCategoryTitle":null,"ParaCatCode":null}],"dasthemes":null,"projects":[{"ProID":4128,"Acronym":null,"Progress":"Completed","StandardTitle":"Raamovereenkomst ecologische advisereing en onderzoek tussen W&Z en het INBO","FP7Code":null,"GrantDOI":null,"FunderID":null,"FunderIDType":null,"FunderCodes":[]}],"refs":[{"0":211832,"BRefID":211832,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"<b>Mouton, A.M. <i>et al.</i></b> (2011). Adjusted barrier management to improve glass eel migration at an estuarine barrier. <i>Mar. Ecol. Prog. Ser. 439</i>: 213-222. <a href=\"http://dx.doi.org/10.3354/meps09325\" target=\"_blank\">dx.doi.org/10.3354/meps09325</a>","RR":"<b>Mouton, A.M. <i>et al.</i></b> (2011). Adjusted barrier management to improve glass eel migration at an estuarine barrier. <i>Mar. Ecol. Prog. Ser. 439</i>: 213-222. <a href=\"http://dx.doi.org/10.3354/meps09325\" target=\"_blank\">dx.doi.org/10.3354/meps09325</a>","4":"Adjusted barrier management to improve glass eel migration at an estuarine barrier","StT":"Adjusted barrier management to improve glass eel migration at an estuarine barrier","5":"Mouton, A.M.; Stevens, M.; Van den Neucker, T.; Buysse, D.; Coeck, J.","RSA":"Mouton, A.M.; Stevens, M.; Van den Neucker, T.; Buysse, D.; Coeck, J.","6":"Gebaseerd op deze dataset","DutchTerm":"Gebaseerd op deze dataset","7":2011,"AnaDate":2011,"8":null,"MonDate":null,"9":". <i>Mar. Ecol. Prog. Ser. 439</i>: 213-222. <a href=\"https://dx.doi.org/10.3354/meps09325\" target=\"_blank\">https://dx.doi.org/10.3354/meps09325</a>","":". <i>Mar. Ecol. Prog. Ser. 439</i>: 213-222. <a href=\"https://dx.doi.org/10.3354/meps09325\" target=\"_blank\">https://dx.doi.org/10.3354/meps09325</a>","10":"https://dx.doi.org/10.3354/meps09325","doi":"https://dx.doi.org/10.3354/meps09325"},{"0":195950,"BRefID":195950,"1":"Based on this dataset","Relation":"Based on this dataset","2":2,"RelationID":2,"3":"<b>Mouton, A. <i>et al.</i></b> (2009). Onderzoek naar glasaalmigratiemogelijkheden in de Ganzepoot (IJzermonding) in Nieuwpoort. <i>Rapport van het Instituut voor Natuur- en Bosonderzoek</i>, R.2009.62. Instituut voor Natuur- en Bosonderzoek (INBO): Brussel.  31 pp.","RR":"<b>Mouton, A. <i>et al.</i></b> (2009). Onderzoek naar glasaalmigratiemogelijkheden in de Ganzepoot (IJzermonding) in Nieuwpoort. <i>Rapport van het Instituut voor Natuur- en Bosonderzoek</i>, R.2009.62. Instituut voor Natuur- en Bosonderzoek (INBO): Brussel.  31 pp.","4":"Onderzoek naar glasaalmigratiemogelijkheden in de Ganzepoot (IJzermonding) in Nieuwpoort","StT":"Onderzoek naar glasaalmigratiemogelijkheden in de Ganzepoot (IJzermonding) in Nieuwpoort","5":"Mouton, A.; Gelaude, E.; Buysse, D.; Stevens, M.; Van den Neucker, T.; Martens, S.; Jacobs, Y.; Coeck, J.","RSA":"Mouton, A.; Gelaude, E.; Buysse, D.; Stevens, M.; Van den Neucker, T.; Martens, S.; Jacobs, Y.; Coeck, J.","6":"Gebaseerd op deze dataset","DutchTerm":"Gebaseerd op deze dataset","7":null,"AnaDate":null,"8":2009,"MonDate":2009,"9":". <i>Rapporten van het Instituut voor Natuur- en Bosonderzoek</i>, R.2009.62. Instituut voor Natuur- en Bosonderzoek (INBO): Brussel.  31 pp.","":". <i>Rapporten van het Instituut voor Natuur- en Bosonderzoek</i>, R.2009.62. Instituut voor Natuur- en Bosonderzoek (INBO): Brussel.  31 pp.","10":null,"doi":null}],"urls":null,"pictures":null,"urlmaps":null,"spatreps":null,"fileformats":null,"resmessage":"","complete":1}