Age validation of canary rockfish (Sebastes pinniger) using two independent otolith techniques

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Andrews, A. H., Kerr, L. A., Cailliet, G. M., Brown, T. A., Lundstrom, C. C., & Stanley, R. D. (2007). Age validation of canary rockfish (Sebastes pinniger) using two independent otolith techniques: Lead-radium and bomb radiocarbon dating. Marine and Freshwater Research, 58(6), 531-541. doi:10.1071/MF07074
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TitleAge validation of canary rockfish (Sebastes pinniger) using two independent otolith techniques
AuthorsA. Andrews, L. Kerr, G. Cailliet, T. Brown, C. Lundstrom, R. Stanley
AbstractCanary rockfish (Sebastes pinniger) have long been an important part of recreational and commercial rockfish fishing from south-east Alaska to southern California, but localised stock abundances have declined considerably. Based on age estimates from otoliths and other structures, lifespan estimates vary from ∼20 years to over 80 years. For the purpose of monitoring stocks, age composition is routinely estimated by counting growth zones in otoliths; however, age estimation procedures and lifespan estimates remain largely unvalidated. Typical age validation techniques have limited application for canary rockfish because they are deep-dwelling and may be long-lived. In this study, the unaged otolith of the pair from fish aged at the Department of Fisheries and Oceans Canada was used in one of two age validation techniques: (1) lead-radium dating and (2) bomb radiocarbon (14C) dating. Age estimate accuracy and the validity of age estimation procedures were validated based on the results from each technique. Lead-radium dating proved successful in determining that a minimum estimate of lifespan was 53 years and provided support for age estimation procedures up to ∼50-60 years. These findings were further supported by Δ14C data, which indicated that a minimum estimate of lifespan was 44 ± 3 years. Both techniques validate, to differing degrees, age estimation procedures and provide support for inferring that canary rockfish can live more than 80 years. © CSIRO 2007.
JournalMarine and Freshwater Research
Date2007
Volume58
Issue6
Start page531
End page541
ISSN1323-1650
Subjectsaccelerator mass spectrometry, age structure, carbon isotope, lead isotope, otolith, population decline, radiocarbon dating, radiometer, radium isotope, stock assessment, teleost, Alaska, California, North America, United States, Scorpaenidae, Sebastes pinniger
NoteCited By (since 1996):12, Fish and Fisheries, CODEN: AJMFA

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