{"refrec":{"BRefID":133322,"RR":"<b>Rätz, H.-J.; Bethke, E.; Hölker, F.; Gröhsler, T.</b> (2008). Simulierte Auswirkungen des mehrjährigen Bewirtschaftungsplans für die Dorschfischerei in der westlichen Ostsee und die Möglichkeit einer technischen Alternative = Impact simulation of the multi-annual management plan of cod fisheries in the Western Baltic and the option of a technical alternative. <i>Inf. Fischereiforsch. 55</i>: 36-44","BEntID":127287,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Inf. Fischereiforsch. 55</i>: 36-44","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rätz, H.-J.; Bethke, E.; Hölker, F.; Gröhsler, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rätz, H.-J. <i>et al.</i>","Englishabstract":"The cod stock in the Western Baltic Sea is assessed to be overfished regarding the definitions of the UN World Summit on Sustainable Development at Johannesburg in 2002. Thus, the European Fisheries Council enforced a multi-annual management plan in 2007. Our medium term simulations over the future 10 years assume similar stock productivity as compared with the past four decades and indicate that the goals of the management plan can be achieved through TAC and consistenteffort regulations. Taking account of the uncertainty in the recruitment patterns, the target average fishing mortality of age groups 3 - 6 years of F = 0.6 per year as defined in the management plan is indicated to exceed sustainable levels consistent with high long term yields and low risk of depletion. The stipulated constraint of the annual TAC variations of ±15% will dominate future fisheries management and implies a high recovery potential of the stock through continued reductions in fishing mortality. The scientific assessment of sustainable levels of exploitation and consideration in the plan is strongly advised, taking account of uncertainties attributed to environmental and biological effects. We recommend our study to be complemented with economic impact assessments including effects on by-catch species, which have been disregarded in this study. It is further demonstrated, that the goals of the management plan can alternatively be achieved by mesh size adaptations. An alternative technical option of mesh size increases to realize the required reductions in fishing mortality provides avoidance of discards of undersized fish after a few years by means of improved selectivity, another important element of the Common Fisheries Policy. However, it is emphasized that technical regulations since 1990 failed to affect the by-catch and discards of juvenile cod. In any way, the meaningful implementation of the multiannual management plan through stringent control and enforcement appears critical.","AbstractOtherLang":"Unter Berücksichtigung der UN-Kriterien für eine nachhaltige Entwicklung (Johannesburg 2002) gilt der Dorschbestand der westlichen Ostsee (Gebiete 22 - 24) als überfischt. Aus diesem Grund hat der Europäische Fischereirat 2007 einen mehrjährigen Bewirtschaftungsplan erlassen. Unsere mittelfristigen Simulationen (Zeitraum: 10 Jahre) basieren auf der Annahme einer unveränderten Produktivität des Bestandes. Die Simulationsergebnisse deuten darauf hin, dass die Ziele des mehrjährigen Bewirtschaftungsplans mit den vorgesehenen Regelungen der Höchstfangmengen und entsprechenden Bestimmungen des Fischereiaufwands zu erreichen sind. Dagegen scheint die festgesetzte Zielgröße eines mittleren Nutzungsgrades der Altersgruppen 3 - 6 Jahre von F = 0,6 bei der beobachteten Variation im Jungfischaufkommen nicht konsistent mit den Forderungen nach hohen Dauererträgen bei einem niedrigem Risiko eines Erschöpfungszustands zu sein. Jedoch würde eine maximale Variation der jährlichen Höchstfangmengen auf ±15 % ohnehin das künftige Fischereimanagement dominieren. Dies impliziert ein hohes Erholungspotential durch eine anhaltende Reduktion des fischereilichen Nutzungsgrades. Eine wissenschaftliche Abschätzung des nachhaltigen Nutzungsgrades unter Einbeziehung ökologischer Effekte ist daher dringend angeraten. Zusätzlich sollten die Ergebnisse dieser Studie mit fischereiökonomischen Analysen kombiniert werden, die zudem die Beifänge anderer Arten mit einbeziehen. Ein weiteres Ergebnis dieser Studie ist, dass die Ziele des mehrjährigen Bewirtschaftungsplans theoretisch auch mit der technischen Option einer schrittweisen Vergrößerung der Maschenöffnung realisiert werden könnten. Eine entsprechende Option bewirkte in den Simulationen nach wenigen Jahren eine verbesserte Selektion und somit verringerte Rückwürfe untermaßiger Fische, eine wichtiges Element der Gemeinsamen Fischereipolitik. Allerdings waren technische Maßnahmen seit 1990 ohne nachweisbaren Effekt auf Beifänge und Rückwürfe von Jungdorschen. In jedem Fall erscheint die sinngerechte Umsetzung des mehrjährigen Bewirtschaftungsplans nur unter der Voraussetzung effektiver Fischereikontrollen möglich.","BibLvlCode":"AS","StandardTitle":"Simulierte Auswirkungen des mehrjährigen Bewirtschaftungsplans für die Dorschfischerei in der westlichen Ostsee und die Möglichkeit einer technischen Alternative = Impact simulation of the multi-annual management plan of cod fisheries in the Western Baltic and the option of a technical alternative","OrigTitleLangCode":"de","OrigTitleLangCodeExtended":"ger","OrigTitleLangID":13,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2008,"MonPub":null,"DateUpdate":"2009-04-07","DateCreate":"2009-04-07","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":133322,"PubliDate":2008,"Pagination":"36-44","XtraPublOfAnaID":null,"ISBN":null,"Volume":"55","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":80464,"SerRR":"Informationen aus der Fischereiforschung = Information on Fishery Research. Bundesforschungsanstalt für Fischerei: Hamburg.  ISSN 1861-2164; e-ISSN 1861-2164","StandardTitleSer":"Informationen aus der Fischereiforschung = Information on Fishery Research","ISSN":"1861-2164","AbbrevSer":"Inf. Fischereiforsch.","StandardTitleMon":null,"StartPage":36,"Pages":9,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Rätz","Firstname":"Hans-Joachim","Initials":"H.-J.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":127287,"AutID":25228,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Bethke","Firstname":"Eckhard","Initials":"E.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":127287,"AutID":3158,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Hölker","Firstname":"Franz","Initials":"F.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":127287,"AutID":73868,"OrderNr":3,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null},{"AutName":"Gröhsler","Firstname":"Tomas","Initials":"T.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":127287,"AutID":25225,"OrderNr":4,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":null,"PersID":null,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":null,"BEntPrivate":null,"availability":[{"BInstID":146712,"LibID":36,"BRefID":133322,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"146712","RFID":null,"PaidValue":null,"Medium":"Server","Description":"VLIZ Open Access","Acronym":"VLIZ","Library":"Vlaams Instituut voor de Zee","DutchTerm":"Open access","URL":null,"ClassifID":53,"Classification":"Open access","ReqLink":null,"ClassifTypID":1,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":null,"InternalReq":0,"LoggedInReq":0,"Disclaimer":null,"DutchDisclaimer":null,"FileFormat":".pdf","FileDescr":"pdf","InsPub":1,"InsID":36,"FileFormID":6,"LendableFlag":1,"PublicFlag":1,"orderLib":"A","Notes":null,"AccConID":null,"AccessConstraint":null,"LicURL":null}],"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":[{"PublName":"Bundesforschungsanstalt für Fischerei","City":"Hamburg"}],"MONpubls":null,"pictures":[],"thestermsPath":null,"thestermsASFA":null,"taxtermsASFA":null,"geotermsASFA":null,"collections":null,"conf":null,"proj":null,"Physdatasets":null,"spcols":null,"doi":null,"publs":null,"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":127287,"AbstractFlag":-1,"LangID":13,"LangCode":"de","Lang":"German","DutchTerm":"Duits","LangCodeExtended":"ger"},{"BEntID":127287,"AbstractFlag":-1,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"},{"BEntID":127287,"AbstractFlag":0,"LangID":13,"LangCode":"de","Lang":"German","DutchTerm":"Duits","LangCodeExtended":"ger"}],"urls":null,"thesterms":null,"taxterms":null,"geoterms":null,"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":null,"taxtermsFRIS":null,"geotermsFRIS":null,"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Dewitte, Elien, E.","newSesDate":{"date":"2009-04-07 08:54:47.650000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Dewitte, Elien, E.","updSesDate":{"date":"2009-04-07 08:54:47.650000","timezone_type":3,"timezone":"Europe/Brussels"}}}