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VALIDATION OF OTOLITH-INCREMENT AGE ESTIMATES FOR A DEEP-WATER FISH SPECIES, THE WARTY OREO ALLOCYTTUS-VERRUCOSUS, BY RADIOMETRIC ANALYSIS

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JournalMarine Biology
DatePublished - Jul 1995
Issue number1
Volume123
Number of pages10
Pages (from-to)29-38
Original languageEnglish

Abstract

Otolith increment age estimates for a deepwater species, Allocyttus verrucosus, were validated by comparison with the results from Pb-210:Ra-226 radiometric analysis. Transverse sectioning and subsequent grinding of otoliths to a thickness of similar or equal to 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.

    Research areas

  • PSEUDOCYTTUS-MACULATUS, THALASSOMA-BIFASCIATUM, SMOOTH OREO, MURRAY COD, BLACK OREO, GROWTH, LONGEVITY, PISCES, REEF, PERCICHTHYIDAE

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