Age estimation and lead-radium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea

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Brooks, C. M., Andrews, A. H., Ashford, J. R., Ramanna, N., Jones, C. D., Lundstrom, C. C., & Cailliet, G. M. (2011). Age estimation and lead-radium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea. Polar Biology, 34(3), 329-338. doi:10.1007/s00300-010-0883-z
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TitleAge estimation and lead-radium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea
AuthorsC. Brooks, A. Andrews, J. Ashford, N. Ramanna, C. Jones, C. Lundstrom, G. Cailliet
AbstractAntarctic toothfish (Dissostichus mawsoni) are the target of an important commercial fishery in the Southern Ocean, yet age data used for management have not been comprehensively tested for accuracy. In this study, Antarctic toothfish were aged using counts of otolith growth zones based on criteria established for Patagonian toothfish, D. eleginoides, a closely related species. To validate these ages, the radioactive disequilibrium of lead-210 and radium-226 in otolith cores was measured and used as an independent chronometer to accurately determine age across the range of fish caught in large numbers by the fishery. Growth-zone counts indicated Antarctic toothfish live to at least 39 years of age, and were in close agreement with the chronometer, validating the age estimation criteria and the accuracy of age estimates. Von Bertalanffy growth function parameters indicated Antarctic toothfish were relatively slow-growing (k = 0.111), especially in relation to their maximum size (L ∞ = 158.9 cm). © 2010 Springer-Verlag.
JournalPolar Biology
Date2011
Volume34
Issue3
Start page329
End page338
ISSN0722-4060
Subjectsage class, body size, commercial species, data set, dating method, lead isotope, otolith, perciform, radiometric method, radium, radium isotope, von Bertalanffy equation, Ross Sea, Southern Ocean, Dissostichus mawsoni, Nototheniidae
NoteCited By (since 1996):4, Fish and Fisheries, CODEN: POBID

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