{"refrec":{"BRefID":29853,"RR":"<b>Rodríguez-Marín, E.; Ruiz, M.; Sarasua, A.</b> (2002). Validation of roughhead grenadier (<i>Macrourus berglax</i>) otolith reading. <i>J. Appl. Ichthyol. 18(2)</i>: 70-80. <a href=\"https://dx.doi.org/10.1046/j.1439-0426.2002.00330.x\" target=\"_blank\">https://dx.doi.org/10.1046/j.1439-0426.2002.00330.x</a>","BEntID":29853,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Appl. Ichthyol. 18(2)</i>: 70-80. <a href=\"https://dx.doi.org/10.1046/j.1439-0426.2002.00330.x\" target=\"_blank\">https://dx.doi.org/10.1046/j.1439-0426.2002.00330.x</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rodríguez-Marín, E.; Ruiz, M.; Sarasua, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rodríguez-Marín, E.; Ruiz, M.; Sarasua, A.","Englishabstract":"Roughhead grenadier<i>Macrourus berglax</i> Lacépède 1802, is becoming an important commercial fish in the north-west Atlantic fisheries and reliable age information is needed for its assessment. <i>Macrourus berglax</i> has been aged by counting otolith growth zones assumed to represent anulli. Three validation methods were applied: back-calculation of length-at-age, length-frequency analysis, and analyses of the progression of the length mode of an exceptionally large year class. Results on size-at-age estimated by otolith growth zone counts, length-frequency analysis of pre-anal fin length and modal progression were internally consistent, but estimates by back-calculation were different. This latter method produces unrealistic growth curves for each sex due to the weak relationship between otolith size as measured and pre-anal fin length. Up to age 8-9 the size-at-age were the same for males and females; thereafter males were smaller than females. Male growth rate declined when pre-anal fin length reached 18 cm at around age 9, whereas the growth of females started to decline at about 30 cm at around age 16. The Von Bertalanffy growth model derived from otolith analysis was similar to that obtained by the Multifan length frequency analysis model, and gave realistic values of L<sub>inf</sub>, close to the maximum anal fin lengths found in catches. The results showed that <i>Macrourus berglax</i> has a prolonged life cycle and differences in growth between males and females.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Validation of roughhead grenadier (<i>Macrourus berglax</i>) otolith reading","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:04.374588","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":"Roughhead grenadie; <i>Macrourus berglax</i> Lacépède 1802; the north-west Atlantic","Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2002-12-05","DateCreate":"2002-12-05","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000175166300002","VABBcode":null,"OpenAcc":0,"DOI":"10.1046/j.1439-0426.2002.00330.x"},"refs":null,"anarec":{"AnaID":29853,"PubliDate":2002,"Pagination":"70-80","XtraPublOfAnaID":null,"ISBN":null,"Volume":"18","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43023,"SerRR":"Journal of Applied Ichthyology = Zeitschrift für angewandte Ichthyologie. Blackwell: Berlin.  ISSN 0175-8659; e-ISSN 1439-0426","StandardTitleSer":"Journal of Applied Ichthyology = Zeitschrift für angewandte Ichthyologie","ISSN":"0175-8659","AbbrevSer":"J. Appl. Ichthyol.","StandardTitleMon":null,"StartPage":70,"Pages":11,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Rodríguez-Marín","Firstname":null,"Initials":"E.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":29853,"AutID":32617,"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":"Ruiz","Firstname":"Milena","Initials":"M.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":29853,"AutID":28056,"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":"Sarasua","Firstname":null,"Initials":"A.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":29853,"AutID":32618,"OrderNr":3,"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":null,"litstyles":null,"thespers":null,"arch2discl":null,"SERpubls":[{"PublName":"Blackwell","City":"Berlin"}],"MONpubls":null,"pictures":[],"thestermsPath":[{"ThesaurusTerm":"Age","ThestID":182,"Acronym":"ASFA","ThesTermPath":"Age"},{"ThesaurusTerm":"Otolith reading","ThestID":5882,"Acronym":"ASFA","ThesTermPath":"Age determination > Otolith reading"},{"ThesaurusTerm":"Marine fish","ThestID":5000,"Acronym":"ASFA","ThesTermPath":"Aquatic organisms > Marine organisms > Fish > Marine fish"},{"ThesaurusTerm":"AW, North Atlantic","ThestID":183069,"Acronym":"ASFA_GEOT","ThesTermPath":"AW, North Atlantic"},{"ThesaurusTerm":"Life cycle","ThestID":4696,"Acronym":"ASFA","ThesTermPath":"Cycles > Life cycle"},{"ThesaurusTerm":"Length","ThestID":4675,"Acronym":"ASFA","ThesTermPath":"Dimensions > Length"},{"ThesaurusTerm":"Size","ThestID":7689,"Acronym":"ASFA","ThesTermPath":"Dimensions > Size"},{"ThesaurusTerm":"Marine fisheries","ThestID":5001,"Acronym":"ASFA","ThesTermPath":"Fisheries > Marine fisheries"},{"ThesaurusTerm":"Growth","ThestID":3830,"Acronym":"ASFA","ThesTermPath":"Population functions > Growth"}],"thestermsASFA":[{"ThesaurusTerm":"Age"},{"ThesaurusTerm":"AW, North Atlantic"},{"ThesaurusTerm":"Growth"},{"ThesaurusTerm":"Length"},{"ThesaurusTerm":"Life cycle"},{"ThesaurusTerm":"Marine fish"},{"ThesaurusTerm":"Marine fisheries"},{"ThesaurusTerm":"Otolith reading"},{"ThesaurusTerm":"Size"}],"taxtermsASFA":[{"TaxTerm":"Macrourus berglax, (Lacépède, 1802)"}],"geotermsASFA":[{"GeoTerm":"North Atlantic Ocean"}],"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":29853,"AbstractFlag":0,"LangID":15,"LangCode":"en","Lang":"English","DutchTerm":"Engels","LangCodeExtended":"eng"}],"urls":[{"URL":"https://dx.doi.org/10.1046/j.1439-0426.2002.00330.x","externalID":"10.1046/j.1439-0426.2002.00330.x","URLTypeCode":"DOI","URLID":111411,"URLTypID":13,"URLType":"DOI","URLPrefix":"http://dx.doi.org/"}],"thesterms":[{"ThesaurusTerm":"Age","ThestID":182,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"AW, North Atlantic","ThestID":183069,"Acronym":"ASFA_GEOT","ThesTypID":34,"ThesType":"ASFA Geoterms"},{"ThesaurusTerm":"Growth","ThestID":3830,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Length","ThestID":4675,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Life cycle","ThestID":4696,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Marine fish","ThestID":5000,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Marine fisheries","ThestID":5001,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Otolith reading","ThestID":5882,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Size","ThestID":7689,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"}],"taxterms":[{"TaxTerm":"Macrourus berglax, (Lacépède, 1802)","AphiaID":126472,"TaxtID":23454}],"geoterms":[{"GeoTerm":"North Atlantic Ocean","GeoObjectID":1912,"GeotID":1353}],"othterms":[{"OtherTerm":"<i>macrourus berglax</i> lacépède 1802","OthtID":4925},{"OtherTerm":"Roughhead grenadie","OthtID":4212},{"OtherTerm":"The north-west atlantic","OthtID":9093}],"asfacodes":null,"asfa2codes":null,"thestermsFRIS":[{"ThesaurusTerm":"Age","DutchTerm":"Leeftijd","ThestID":182,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"AW, North Atlantic","DutchTerm":null,"ThestID":183069,"Acronym":"ASFA_GEOT","ThesTypID":34,"ThesType":"ASFA Geoterms"},{"ThesaurusTerm":"Growth","DutchTerm":"Groei","ThestID":3830,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Length","DutchTerm":"Lengte","ThestID":4675,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Life cycle","DutchTerm":"Levenscyclus","ThestID":4696,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Marine fish","DutchTerm":"Mariene vis","ThestID":5000,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Marine fisheries","DutchTerm":"Zeevisserij","ThestID":5001,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Otolith reading","DutchTerm":null,"ThestID":5882,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"},{"ThesaurusTerm":"Size","DutchTerm":"Grootte","ThestID":7689,"Acronym":"ASFA","ThesTypID":1,"ThesType":"ASFA Thesaurus List"}],"taxtermsFRIS":[{"TaxTerm":"Macrourus berglax, (Lacépède, 1802)","DutchTerm":"grenadiervis","AphiaID":126472,"TaxtID":23454}],"geotermsFRIS":[{"GeoTerm":"North Atlantic Ocean","DutchTerm":null}],"othtermsFRIS":[{"OtherTerm":"<i>macrourus berglax</i> lacépède 1802","DutchTerm":null,"OthtID":4925},{"OtherTerm":"Roughhead grenadie","DutchTerm":null,"OthtID":4212},{"OtherTerm":"The north-west atlantic","DutchTerm":null,"OthtID":9093}],"resmessage":"","complete":1,"sessions":{"newSesName":"Chisala, Chilekwa, C.","newSesDate":{"date":"2002-12-05 12:19:43.917000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Chisala, Chilekwa, C.","updSesDate":{"date":"2002-12-05 12:19:43.917000","timezone_type":3,"timezone":"Europe/Brussels"}}}