Radiometric age validation of Atlantic tarpon, Megalops atlanticus

Downloaded 70 times.

Primary tabs

Andrews, A. H., Burton, E. J., Coale, K. H., Cailliet, G. M., & Crabtree, R. E. (2001). Radiometric age validation of Atlantic tarpon, Megalops atlanticus. Fishery Bulletin, 99(3), 389-398.
PDF
Metadata
TitleRadiometric age validation of Atlantic tarpon, Megalops atlanticus
AuthorsH. Andrews, J. Burton, H. Coale, M. Cailliet, E. Crabtree
AbstractAn improved radiometric aging technique was used to examine annulus-derived age estimates from otoliths of the Atlantic tarpon, Megalops atlanticus. Whole otoliths from juvenile fish and otolith cores, representing the first 2 years of growth, from adult fish were used to determine 210Pb and 226Ra activity; six age groups consisting of pooled otoliths and nine individual otolith cores were aged. This unprecedented use of individual otolith cores to determine age was possible because of improvements made to the 226Ra determination technique. The disequilibria of 210Pb:226Ra for these samples were used to determine radiometric age. Annulus-derived age estimates did not agree closely with radiometric age determinations. In most cases, the precision (CV≤12%) among the otolith readings could not explain the differences. The greatest radiometric age was 78.0 yr for a 2045-mm-FL female, where the radiometric error encompassed the annulus-derived age estimate of 55 yr by about 4 yr. The greatest radiometric age for males was 41.0 yr for a 1588-mm-FL tarpon, where the radiometric error encompassed the annulus-derived age estimate of 32 yr by 1 yr. Radiometric age determinations in this study indicated that the interpretation of growth zones in Atlantic tarpon otoliths can be difficult, and in some cases may be inaccurate. This study provides conclusive evidence that the longevity of the Atlantic tarpon is greater than 30 years for males and greater than 50 years for females.
JournalFishery Bulletin
Date2001
Volume99
Issue3
Start page389
End page398
ISSN00900656
Subjectsage determination, otolith, radiometric method, Megalops atlanticus
NoteCited By (since 1996):9, CODEN: FSYBA

Bookmark

Bookmarks: