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Validation of age and growth in a long-lived temperate reef fish using otolith structure, oxytetracycline and bomb radiocarbon methods


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Ewing, GP and Lyle, JM and Murphy, RJ and Kalish, JM and Ziegler, PE (2007) Validation of age and growth in a long-lived temperate reef fish using otolith structure, oxytetracycline and bomb radiocarbon methods. Marine and Freshwater Research, 58 (10). pp. 944-955. ISSN 1323-1650

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Generating age estimates for long-lived fish requires particular attention to validation because they are usually difficult to age owing to narrow increment structure. A robust validation of the accuracy and precision of banded morwong, Cheilodactylus spectabilis, sampled from Tasmanian waters, was undertaken. Age at the first enumerated increment was established from analysis of juvenile cohorts, and the timing and periodicity of increment formation was established using a quantitative model from oxytetracycline (OTC) mark-recaptures at liberty for periods of up to 8 years. The accuracy of age estimates was examined independently by comparing radiocarbon values in the otolith region corresponding to the first year of growth against the south-western Pacific calibration curve. C. spectabilis is very long-lived, with males and females living to over 90 years of age. Growth modelling revealed a fast initial growth phase, terminating in an abrupt plateau near the asymptotic length. This species displays substantial sexual dimorphism in growth, with males growing to larger sizes than females.

Item Type: Article
Keywords: Cheilodactylidae; Longevity
Journal or Publication Title: Marine and Freshwater Research
Page Range: pp. 944-955
ISSN: 1323-1650
Identification Number - DOI: 10.1071/MF07032
Additional Information:

Copyright CSIRO 2007

Date Deposited: 20 May 2008 13:09
Last Modified: 18 Nov 2014 03:41
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