{"refrec":{"BRefID":13111,"RR":"<b>Krijgsman, J.A.</b> (1971). Onderzoek aan spiering als oorzaak van het voorkomen van groepsgewijs vissende meeuwen in de Waddenzee, met systematische en populatie-dynamische gegevens over de spiering <i>Osmerus eperlanus</i> L. <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1971(10). Nederlands Instituut voor Onderzoek der Zee: Texel. 58 pp.","BEntID":13111,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1971(10). Nederlands Instituut voor Onderzoek der Zee: Texel.  58 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Krijgsman, J.A.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Krijgsman, J.A.","Englishabstract":"From 1-8-70 till 31-3-71 research was done on the cause of the phenomenon of fishing seagulls taking place in the Wadden Sea and on the systematic and population-dynamic aspects of the smelt from the Wadden Sea and the Ysel Lake. The phenomenon of fishing in groups of the black-headed gull, turned out to be caused by the smelts in the water surface. This is being caused by: turbulence in the scour stream by scour locks in the Afsluitdyke, causing the smelts sluiced from the Ysel Lake, are brought to the surface and through panic reactions of the smelts in the channels, which are caused by the strong changes in salinity, causing the smelts to rise to the surface. In aquaria smelts turned out to avoid every change in the salinity and panic reactions were observed. A method to determine the age and the speed of growth, according to the scales, is being described. The great majority of the captured smelts belonged to the 0-group, so not a year old yet. The population density in the Ysel Lake was high. In September the number of smelts was probably higher than 3 billion. In the Wadden Sea the population density varied enormously. The number was estimated at 10 to 30 million. The smelt from the Ysel Lake and the Wadden Sea was for 98 to 99% contaminated with cysts of meacercaria of the parasite <i>Cotylurus erraticus</i> (Rudolphi, 1809). Great smelts from the Texel stream were usually not contaminated. It turned out there were about four arguments to distinguish two varieties, namely, a fast-growing up to 30 cm long variety, and one that remained small, a mere 10 to 12 cm of length variety.","AbstractOtherLang":"Van 1-8-70 tot 31-3-71 werd onderzoek verricht naar de oorzaak van het in de Waddenzee optredende verschijnsel van vissende meeuwen en naar systematische en populatie-dynamische aspecten van de spiering uit de Waddenzee en het IJsselmeer. Het verschijnsel van groepsgewijs vissende kokmeeuwen bleek veroorzaakt te worden door in het oppervlaktewater komende spieringen. Dit wordt veroorzaakt door: turbulentie in de spuistroom bij de spuisluizen van de Afsluitdijk, waardoor uit het IJsselmeer gespuide spieringen aan de oppervlakte gebracht worden en door schrikreacties van de spieringen in de geulen, welke veroorzaakt worden door sterke veranderingen van het zoutgehalte, waardoor spieringen naar de oppervlakte komen. In aquaria bleken spieringen iedere verandering van het zoutgehalte te mijden en werden schrikreacties waargenomen. Een methode om de leeftijd en groeisnelheid aan de hand van de schubben te bepalen werd beschreven. Het overgrote deel van de gevangen spieringen was van de 0-groep, dus nog geen jaar oud. De populatiedichtheid in het IJsselmeer was groot. Het aantal spieringen bedroeg in september 1970 waarschijnlijk mer dan drie miljard. In de Waddenzee bleek de populatiedichtheid sterk te variëren. Het aantal spieringen werd geschat op 10 tot 30 miljoen. De spiering uit het IJsselmeer en uit de Waddenzee was voor 98 tot 99% besmet met cysten van metacercariën van de parasiet <i>Cotylurus erraticus</i> (Rudolphi, 1809). Grote spieringen uit de Texelstroom waren meestal niet besmet. Er bleken een viertal argumenten te zijn om twee variëteiten te onderscheiden, nl. een snelgroeiende tot ongeveer 30 cm lang wordende variëteit, en een kleinblijvende, slechts 10 tot 12 cm lang wordende variëteit.","BibLvlCode":"MS","StandardTitle":"Onderzoek aan spiering als oorzaak van het voorkomen van groepsgewijs vissende meeuwen in de Waddenzee, met systematische en populatie-dynamische gegevens over de spiering <i>Osmerus eperlanus</i> L","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-22 01:33:06.175990","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1971,"DateUpdate":"2025-07-15","DateCreate":"2001-07-10","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":13111,"ISBN":null,"PubliDate":1971,"IssueDate":null,"Volume":"1971","Issue":"10","Pagination":"58","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5036,"SerRR":"Interne verslagen Nederlands Instituut voor Onderzoek der Zee. 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