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Validation of age and growth estimates using thin otolith sections from the purple wrasse, Notolabrus fucicola


Ewing, G and Welsford, D and Jordan, AR and Buxton, CD, Validation of age and growth estimates using thin otolith sections from the purple wrasse, Notolabrus fucicola, Marine and Freshwater Research, 54, (8) pp. 985-993. ISSN 1323-1650 (2003) [Refereed Article]

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CSIRO 2003

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DOI: doi:10.1071/MF02116


The age of Notolabrus fucicola from the east and southeast coasts of Tasmania was estimated from counts of opaque (transmitted light) growth zones in thin transverse sections of sagittal otoliths. The position of the first annulus was validated through the otolith radii of known-age juveniles. Marginal increment analysis was performed by examining the growing edge of otoliths over 2 years. This showed that opaque zones were formed annually and were consistently deposited from late September to early December (spring season), which is coincident with annual increases in somatic growth and water temperature during this season. A criterion was developed to ensure accurate age estimation for individuals sampled during the time of year when deposition of opaque material was incomplete or not apparent. The maximum age estimated was 20 years and the relationship between fork length and age was described by the von Bertalanffy growth function (L = 368 mm, K = 0.116 and t0 = -1.87 for males and L = 385.7 mm, K = 0.109 and t0 = -1.96 for females). The clarity of increment structure and rigorous validation protocol that was adopted minimised the risks associated with using marginal increment analysis to validate the periodicity of increment formation and it provided robust age and growth estimates for N. fucicola in Tasmanian waters.

Item Details

Item Type:Refereed Article
Keywords:Australia, Labridae, marginal increment analysis, von Bertalanffy
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Fisheries sciences not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - wild caught
Objective Field:Fisheries - wild caught not elsewhere classified
UTAS Author:Ewing, G (Mr Graeme Ewing)
UTAS Author:Welsford, D (Dr Dirk Welsford)
UTAS Author:Jordan, AR (Dr Alan Jordan)
UTAS Author:Buxton, CD (Professor Colin Buxton)
ID Code:28563
Year Published:2003
Web of Science® Times Cited:13
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2003-08-01
Last Modified:2012-11-06
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