Age estimation and lead�Cradium dating of Antarctic toothfish (Dissostichus mawsoni) in the Ross Sea |
| |
| Authors: | Cassandra M Brooks Allen H Andrews Julian R Ashford Nakul Ramanna Christopher D Jones Craig C Lundstrom Gregor M Cailliet |
| |
| Institution: | (1) Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, CA 95039, USA;(2) Center for Quantitative Fisheries Ecology, Old Dominion University, 800 West 46th Street, Norfolk, VA 23508, USA;(3) Antarctic Ecosystem Research Division, Southwest Fisheries Science Center, NOAA National Marine Fisheries Service, 8604 La Jolla Shores Dr., La Jolla, CA 92037, USA;(4) Department of Geology, University of Illinois-Urbana Champaign, 245 Natural History Building, 1301 W. Green St., Urbana, IL 61801, USA;(5) Present address: NOAA Fisheries, Pacific Islands Fisheries Science Center, Life History Program, Age and Longevity Research, 99-193 Aiea Heights Drive, Suite 417, Aiea, HI 96701, USA |
| |
| Abstract: | Antarctic 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). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
