{"refrec":{"BRefID":36564,"RR":"<b>Jessop, B.M.; Shiao, J.-C.; Iizuka, Y.; Tzeng, W.-N.</b> (2002). Migratory behaviour and habitat use by American eels <i>Anguilla rostrata</i> as revealed by otolith microchemistry. <i>Mar. Ecol. Prog. Ser. 233</i>: 217-229. <a href=\"https://dx.doi.org/10.3354/meps233217\" target=\"_blank\">https://dx.doi.org/10.3354/meps233217</a>","BEntID":36564,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Mar. Ecol. Prog. Ser. 233</i>: 217-229. <a href=\"https://dx.doi.org/10.3354/meps233217\" target=\"_blank\">https://dx.doi.org/10.3354/meps233217</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jessop, B.M.; Shiao, J.-C.; Iizuka, Y.; Tzeng, W.-N.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jessop, B.M. <i>et al.</i>","Englishabstract":"The environmental history of American eels <i>Anguilla rostrata</i> from the East River, Nova Scotia, was investigated by electron microprobe analysis of the Sr:Ca ratio along transects of the eel otolith. The mean (±SD) Sr:Ca ratio in the otoliths of juvenile American eels was 5.42 ×10 -3 ± 1.22 × 10<sup>-3</sup> at the elver check and decreased to 2.38 ×10<sup>-3</sup> ± 0.99 ×10<sup>-3</sup> at the first annulus for eels that migrated directly into the river but increased to 7.28 ×10<sup>-3</sup> ± 1.09 ×10<sup>-3</sup> for eels that had remained in the estuary for 1 yr or more before entering the river. At the otolith edge, Sr:Ca ratios of 4.0 ×10<sup>-3</sup> or less indicated freshwater residence and ratios of 5.0 ×10<sup>-3</sup> or more indicated estuarine residence. Four distinct but interrelated behavioural groups were identified by the temporal changes in Sr:Ca ratios in their otoliths: (1) entrance into freshwater as an elver, (2) coastal or estuarine residence for 1 yr or more before entering freshwater, and, after entering freshwater, (3) continuous freshwater residence until the silver eel stage and (4) freshwater residence for 1 yr or more before engaging in periodic, seasonal movements between estuary and freshwater until the silver eel stage. Small (< 70 mm total length), highly pigmented elvers that arrived early in the elver run were confirmed as slow growing age-1 juvenile eels. Juvenile eels that remained 1 yr or more in the estuary before entering the river contributed to the production of silver eels to a relatively greater extent than did elvers that entered the river during the year of continental arrival.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Migratory behaviour and habitat use by American eels <i>Anguilla rostrata</i> as revealed by otolith microchemistry","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-14 01:31:06.671672","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2003-07-17","DateCreate":"2003-07-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000176283200018","VABBcode":null,"OpenAcc":0,"DOI":"10.3354/meps233217"},"refs":null,"anarec":{"AnaID":36564,"PubliDate":2002,"Pagination":"217-229","XtraPublOfAnaID":null,"ISBN":null,"Volume":"233","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43354,"SerRR":"Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe.  ISSN 0171-8630; e-ISSN 1616-1599","StandardTitleSer":"Marine Ecology Progress Series","ISSN":"0171-8630","AbbrevSer":"Mar. Ecol. Prog. 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