{"refrec":{"BRefID":13278,"RR":"<b>Veldhuyzen, J.P.</b> (1968). Groei en Gonade ontwikkeling bij <i>Cardium edule</i> L. <i>NIOZ-rapport</i>, 1968(4). Nederlands Instituut voor Onderzoek der Zee: Texel. 41 pp.","BEntID":13278,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":" <i>NIOZ-rapport</i>, 1968(4). Nederlands Instituut voor Onderzoek der Zee: Texel.  41 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Veldhuyzen, J.P.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Veldhuyzen, J.P.","Englishabstract":"1,Cockle samples were taken on a flat and in a gully, once a month, from February until June 1968.2. Fixation on formalin does not influence the dry weight, but it does influence the wet weight when compared with boiled cockles: formalin cockles proved to be 1,8x heavier than boiled ones.3, Shell growth: until the 3rd year the percentual increase in length is greater than its thickness. In older cockles the rates are about the same.4, Shell weight per length group decreased in March, but this was already compensated in April.5, Flesh weight (excl. Gonads) decreased until the beginning of April and then an increase was found, the rate of which was highest in May.6, Flesh weight (incl. Gonads) increased already from the beginning of March: the increase of the gonads overcompensated the loss of tissue weight.7, Ovaria: from the beginning of February some showed ripe ova. In the beginning of May all ovaria were ripe and did not show oogonia any larger.8, Testes and ripe sperma from March. In the beginning of May testes weight was highest, but besides of spermia also spermatogonia were still to be seen.9, Eggs and sperm shed from the end of April or the beginning of May (at a temperature of appr. 10°C).10, The cockles from the flat and the gully didn't show much difference. On the flat, the shells were a little bit heavier and the flesh weight was somewhat lower than in the submerged cockles.","AbstractOtherLang":"1, Monstering: van februari tot juni 1968 werden elke maand kokkelmonsters genomen op het Balgzandwad buiten de Marinehaven, vlak bezuiden de Vangdam. Bovendien werden monsters in de Vlieter verzameld, bij boei R N°10 op 4m diepte.2, Fixatie: fixatie op formaline bleek het drooggewicht niet merkbaar te beïnvloeden. De nat-gewichten van op formaline gefixeerde dieren bleken echter 1,8x zo hoog te zijn als van gekookte exemplaren.3, Schelpgroei: Over lengtegroei werden geen gegevens verkregen, afgezien van het resultaat dat het 3de jaar de percentuele lengtegroei belangrijker lijkt dan de diktegroei, terwijl bij oudere kokkels beiden ongeveer gelijk zijn.4, Schelpgewicht: geeft per lengtecategorie vooral in maart een kleine daling te zien, die in april weer gecompenseerd wordt.5, Vleesgewicht: (excl. gonaden): geeft een daling te zien tot begin april, waarna stijging optreedt, die vooral in mei heel sterk wordt. Hierbij is de percentuele gewichtstoename van de voet iets groter dan die van de mantel.6, Vleesgewicht: (incl. gonaden): geeft een stijging reeds vanaf begin maart te zien; dit houdt in dat in maart het verlies aan gewicht van voet en mantel, op het totaal vleesgewicht ruimschoots gecompenseerd wordt door gonadengroei. Na april speelt deze gonadengroei geen rol meer: het gewicht der gonaden neemt dan wat af.7, Ovaria: vertonen bij enkele individuën vanaf februari enige rijpe ova. In april of begin mei bereiken de ovaria hun hoogste gewicht. Begin mei zijn alle ovaria rijp en vertonen weinig of geen oögonia in de follikelwand.8, Testes: vertonen de eerste rijpe spermiën in maart. Begin mei is het testis-gewicht het grootst, maar ook dan ziet men nog veel spermatogonia naast spermiën.9, Geslachtsproducten: worden vanaf eind april of begin mei geloosd (bij een watertemperatuur van ong. 10°C).10, Balgzand- en Vlieterkokkels: op het droogvallende Balgzand vertonen de kokkels per lengtecategorie een iets zwaardere schelp en een wat lager vleesgewicht dan de submerse kokkels uit de Vlieter; overigens waren de verschillen gering.","BibLvlCode":"MS","StandardTitle":"Groei en Gonade ontwikkeling bij <i>Cardium edule</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":1968,"DateUpdate":"2025-07-15","DateCreate":"2001-07-13","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":13278,"ISBN":null,"PubliDate":1968,"IssueDate":null,"Volume":"1968","Issue":"4","Pagination":"41","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5697,"SerRR":"NIOZ-rapport. 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