{"refrec":{"BRefID":108601,"RR":"<b>Maandag, H.</b> (1999). Visstand in de Oosterschelde - augustus 1999. Graduate Thesis. Hogeschool Zeeland: Yerseke.  18 pp.","BEntID":103373,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". Graduate Thesis. Hogeschool Zeeland: Yerseke.  18 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":0,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Maandag, H.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Maandag, H.","Englishabstract":"Sport-fishermen have stated that there aren’t as many fishes in the Oosterschelde as before the construction of the storm surge. For NIOO-CEMO this was the motive to restart their fish research. In the late summer of 1999 CEMO has fished at fourteen stations in the Oosterschelde. Twelve of these stations were also used in a former research (period 1983 - 1990) and two stations are new. The method used is the same as before. The net was a beam trawl with an effective width of 2.7 m and a mesh size of 12 mm. The estimated efficiency is 20%. When possible the haul is 1000m. The density is very high in 1999 compared to the results from the first period.Gobiidae mainly caused the high density. Gadidae and Perciformes also occurred in higher densities. At the two new stations the density is approximately 4-5 times higher than at the other stations. It were mainly Gobiidae, probably because of the lower salinity at these stations. At one of the stations many Clupaeidae have been caught. This probably was coincidentally one shoal. Reduction from 36 to 12 locations can cause a maximum difference of 40% in the density, with an average of 17%, whereas the number of species can be underestimated with 15%.","AbstractOtherLang":"Vanuit de amateurvisserij is naar voren gekomen dat er na het voltooien van de Oosterscheldewerken minder (plat) vis wordt gevangen. Dit is de aanleiding geweest voor het CEMO om het visonderzoek weer op te starten.In de nazomer van 1999 heeft het CEMO op 14 plaatsen in de Oosterschelde gemonsterd met een boomkor. Deze monstername vond plaats op dezelfde wijze als het voorgaande onderzoek in de periode 1983 - 1990. Het aantal oude locaties is teruggebracht van 36 naar 12 (plus 2 nieuwe locaties). De reductie in aantalmonsterplaatsen vond plaats omdat uit het voorgaande onderzoek is gebleken dat er weinig plaatsverschillen zijn. Het gebruikte net is een boomkor van 3 m met een effectieve breedte van 2,70m. De maaswijdte is 12 mm in de kuil van het net. De meeste trekken waren 1000m lang. Vergeleken met de eerste periode (1983-1990) is de dichtheid in 1999 erg hoog. Het zijn vooral grondels die dit jaar veel voor komen. Kabeljauwachtigen en Zeebaarsachtigen komen iets meer voor dan de andere jaren. In de noordelijke tak van de Oosterschelde zijn twee nieuwe locaties bemonsterd. Op deze locaties is de dichtheid wel 4 tot 5 maal hoger dan op de andere plaatsen. Het zijn vooral grondels die hier veel voorkomen, misschien dankzij het iets minder zoutewater. Op de meest noordelijke locatie komen tevens veel haringachtigen voor, waarschijnlijk is hier gewoon bij toeval een school gevangen. Het terugbrengen van het aantal locaties van 36 naar 12 kan een maximaal verschilvan 40% in de dichtheid opleveren. Gemiddeld is het verschil 17%. Het gevangen aantal soorten is theoretisch bij 12 locaties ongeveer 15% lager dan bij 36 locaties.","BibLvlCode":"M","StandardTitle":"Visstand in de Oosterschelde - augustus 1999","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1999,"DateUpdate":"2007-03-15","DateCreate":"2007-03-15","SecASFANote":null,"ConfID":null,"PeerRev":null,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":108601,"ISBN":null,"PubliDate":1999,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"18","Place":"Yerseke","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":null,"SerRR":null,"Ser2BRefID":null,"Ser2RR":null,"StandardTitleSer":null,"ISSN":null,"AbbrevSer":null,"Degree":"Graduate","ThesisID":108601,"InsID":null,"Acronym":"YRE","FullStandardName":"Koninklijk Nederlands Instituut voor Onderzoek der Zee; NIOZ Yerseke; Afdeling Ruimtelijke Ecologie","ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":18},"serrec":null,"relations":null,"relationsRev":null,"addrec":{"Line1":"NIOO-KNAW","Email":"e.debruijn@nioo.knaw.nl","Line2":null,"EnvName":"Netherlands"},"othpubs":null,"ownerships":null,"authors":[{"AutName":"Maandag","Firstname":"Hanneke","Initials":"H.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":103373,"AutID":72348,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":13597,"InsID":null}],"mapdetails":null,"datasets":[{"DasID":1090,"Acronym":null,"Citation":"Maandag H., Hummel H. 1999: Fishstocks in the Oosterschelde (The Netherlands), period 1983-1990 & August 1999. 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