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Validation of Otolith-Increment Age Estimates for a Deep-Water Fish Species, the Warty Oreo Allocyttus-Verrucosus, by Radiometric Analysis

Citation

Stewart, BD and Fenton, GE and Smith, DC and Short, SA, Validation of Otolith-Increment Age Estimates for a Deep-Water Fish Species, the Warty Oreo Allocyttus-Verrucosus, by Radiometric Analysis, Marine Biology, 123, (1) pp. 29-38. ISSN 0025-3162 (1995) [Refereed Article]

DOI: doi:10.1007/BF00350320

Abstract

Otolith increment age estimates for a deepwater species, Allocyttus verrucosus, were validated by comparison with the results from 210Pb:226Ra radiometric analysis. Transverse sectioning and subsequent grinding of otoliths to a thickness of ≃ 0.2 mm revealed increments which provided age estimates for a range of fish sizes. Age estimates ranged from 7 yr for an immature fish of 15.2 cm total length (TL) to 130 yr for a female fish of 36.5 cm TL. Age at maturity was estimated as 28 yr for females and 24 yr for males. In comparison, radiometric analysis of whole otoliths, using a single linear otolith-mass growth-rate model suggested maximum ages of 130 to 170 yr for fish of 34 to 35 cm TL. Radiometric ages were also recalculated using a two-phase otolith-mass growth-rate model in which the growth rate was assumed to slow after maturity to 90% of the pre-maturity rate. This reduced the maximum age to 132±15 yr for a mean fish length of 34.5 cm. Age at maturity for females was estimated at 34 yr. The similarity between age estimates from otolith-increment counts and radiometric analysis strongly supports the accuracy of results from both methods, and encourages further use of such comparisons as an alternative to traditional validation techniques. © 1995 Springer-Verlag.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Fenton, GE (Dr Fenton)
ID Code:6012
Year Published:1995
Web of Science® Times Cited:27
Deposited By:Zoology
Deposited On:1995-08-01
Last Modified:2011-08-25
Downloads:0

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