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Dating Hapuka otoliths using /sup 210/Pb//sup 226/Ra, with comments on dating Orange Roughy otoliths.

By: Whitehead, N.E.
Contributor(s): Ditchburn, R. G | Institute of Geological & Nuclear Sciences Limited.
Material type: materialTypeLabelBookSeries: Institute of Geological & Nuclear Sciences science report ; 96/15.Publisher: Lower Hutt : Institute of Geological & Nuclear Sciences, 1996Description: 17 p.ISBN: 0478095341.ISSN: 1171-9184.Subject(s): OTOLITHS | AGE DETERMINATION | GROPER | ORANGE ROUGHY | FISH | PB-210 | RA-226Holdings: Index record, see serial title. Review: It is shown that Hapuka otoliths cannot be reliably dated using the /sup 210/Pb//sup 226/Ra method because contrary to previous assumptions, excess /sup 210/Pb is incorporated into the outer layers of otoliths which have been taken from old fish, though the /sup 226/Ra incorporation remains normal. This is shown to apply also to Orange Roughy otoliths. Ages based on calculations using previously published methods will be artificially old. (auth)
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ABSTRACT ABSTRACT NIWA BIBLIOGRAPHY
1 Available 108786-1001

13 refs; 3 figs; 2 tables.

It is shown that Hapuka otoliths cannot be reliably dated using the /sup 210/Pb//sup 226/Ra method because contrary to previous assumptions, excess /sup 210/Pb is incorporated into the outer layers of otoliths which have been taken from old fish, though the /sup 226/Ra incorporation remains normal. This is shown to apply also to Orange Roughy otoliths. Ages based on calculations using previously published methods will be artificially old. (auth)

Index record, see serial title.

GN

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