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Age validation, growth modeling, and mortality estimates for striped trumpeter (Latris lineata) from southeastern Australia: making the most of patchy data

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Tracey, SR and Lyle, JM (2005) Age validation, growth modeling, and mortality estimates for striped trumpeter (Latris lineata) from southeastern Australia: making the most of patchy data. Fishery Bulletin, 103 (1). pp. 169-183. ISSN 0090-0656

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Abstract

Age estimates for striped
trumpeter (Latris lineata) from Tasmanian
waters were produced by
counting annuli on the transverse
section of sagittal otoliths and were
validated by comparison of growth
w ith k nown-age indiv iduals and
modal progression of a strong recruitment
pulse. Estimated ages ranged
from one to 43 years; fast growth
rates were observed for the first five
years. Minimal sexual dimorphism
was shown to exist between length,
weight, and growth characteristics of
striped trumpeter. Seasonal growth
variability was strong in individuals
up to at least age four, and growth
rates peaked approximately one month
after the observed peak in sea surface
temperature. A modified two-phase
von Bertalanffy growth function was
fitted to the length-at-age data, and
the transition between growth phases
was linked to apparent changes in
physiological and life history traits,
including offshore movement as fish
approach maturity. The two-phase
curve was found to represent the
mean length at age in the data better
than the standard von Bertalanffy
g rowth function. Total mortality
was estimated by using catch curve
analysis based on the standard and
two-phase von Bertalanffy growth
functions, and estimates of natural
mortality were calculated by using
two empirical models, one based on
longevity and the other based on the
parameters L∞ and k from both growth
functions. The interactions between
an inshore gillnet fishery targeting
predominately juveniles and an offshore
hook fishery targeting predominately
adults highlight the need to
use a precautionary approach when
developing harvest strategies.

Item Type: Article
Journal or Publication Title: Fishery Bulletin
Page Range: pp. 169-183
ISSN: 0090-0656
Date Deposited: 23 Nov 2007 04:31
Last Modified: 18 Nov 2014 03:25
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