New Zealand Journal of Marine and Freshwater Research abstracts
Validated aging methodology using otoliths, and
growth parameters for hoki (Macruronus novaezelandiae)
in New Zealand waters
PETER L. HORN
K. J. SULLIVAN
National Institute of Water & Atmospheric
Research Ltd
P.O. Box 14-901, Kilbirnie
Wellington, New Zealand
Abstract The age of hoki was determined by counting bands in
otolith cross-sections. The technique was validated using the progression of
length modes in length-frequency distributions (for age classes 0+ to 4+) and
the progression of strong and weak year classes in age-frequency distributions
from commercial catches sampled off the west coast of the South Island, New
Zealand, from 1988 to 1994. Von Bertalanffy growth parameters for the west
coast and Cook Strait spawning populations are significantly different,
providing further support for a two-stock hypothesis. In both areas female hoki
have a growth rate significantly faster than males, and also a greater life
expectancy.
Keywords hoki; Macruronus novaezelandiae; age
validation; growth; otoliths
New Zealand Journal of Marine and Freshwater Research, 1996: Vol. 30:
161-174
0028-8330/96/3002-0161 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (1437K); (scanned from paper original: notes about this process)
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