New Zealand Journal of Marine and Freshwater Research abstracts
Size at maturity and seasonal changes in gonad activity of yellowtail
kingfish (Seriola lalandi; Carangidae) in New South Wales,
Australia
B. M. GILLANDERS1
D. J. FERRELL
N. L. ANDREW2
NSW Fisheries Research Institute
P. O. Box 21, Cronulla
NSW 2230, Australia
1Present address: School of Biological Sciences A08, University of
Sydney, NSW 2006, Australia. email: bronwyn@bio.usyd.edu.au
2Present address: National Institute for Water & Atmospheric
Research Ltd, P. O. Box 14 901, Kilbirnie, Wellington, New Zealand.
Abstract Gonad development, seasonal changes in gonad
activity, and size at maturity were investigated in female and male yellowtail
kingfish (Seriola lalandi; Carangidae) collected from New South Wales,
Australia between August 1995 and June 1996. Kingfish displayed peak gonad
activity in December suggesting a summer spawning period. Males matured at
smaller sizes than females. Females first matured at 698 mm fork length
(FL) and 3+ years, but 50% maturity was not attained until 834 mm FL. The
smallest recorded mature male was 360 mm FL and the estimated size at
which 50% of males were mature was 470 mm FL (0+ years). Many female
fish are harvested prior to first reproduction, but the impact of this on the
stock remains unclear.
Keywords Seriola; Carangidae; reproduction;
maturity
M98013
Received 27 March 1998; accepted 23 February 1999
PDF file of entire paper: medium quality (2105K); (scanned from paper original: notes about this process)
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