Age validation of canary rockfish (Sebastes pinniger) using two independent otolith techniques [electronic resource] : lead-radium and bomb radiocarbon dating
- Published:
- Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- PDF-file: 33 pages; size: 0.5 Mbytes
- Additional Creators:
- Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Summary:
- Canary rockfish (Sebastes pinniger) have long been an important part of recreational and commercial rockfish fishing from southeast Alaska to southern California, but localized stock abundances have declined considerably. Based on age estimates from otoliths and other structures, lifespan estimates vary from about 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 a minimum estimate of lifespan was 53 years and provided support for age estimation procedures up to about 50-60 years. These findings were further supported by Δ¹⁴C data, which indicated 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.
- Report Numbers:
- E 1.99:ucrl-jrnl-236244
ucrl-jrnl-236244 - Subject(s):
- Other Subject(s):
- Note:
- Published through SciTech Connect.
11/04/2007.
"ucrl-jrnl-236244"
Marine and Freshwater Research, vol. 58, no. 6, June 29, 2007, pp. 531-541 58 6 ISSN 1323-1650; MFREFX FT
Brown, T A; Andrews, A H; Kerr, L A; Cailliet, G M; Lundstrom, C C; Stanley, R D. - Funding Information:
- W-7405-ENG-48
View MARC record | catkey: 14130497