New Zealand Journal of Marine and Freshwater Research abstracts
Links between climate variation and year class strength of New Zealand
hoki (Macruronus novaezelandiae): an update
B. BULL
M. E. LIVINGSTON
National Institute of Water & Atmospheric Research Ltd
P. O. Box 14 901
Kilbirnie
Wellington, New Zealand
email: b.bull@niwa.cri.nz
Abstract Hoki (
Macruronus novaezelandiae Hector) year
class strength (YCS) varies substantially from year to year. We examined
associations between YCS and climate variables including the Southern
Oscillation Index (SOI), satellite sea surface temperatures (SSTs), synoptic
weather patterns, wind speeds, and the depth of the west coast, South Island,
New Zealand, mixed layer. We evaluated the predictions of a model developed 2
years ago to predict YCS of the western and eastern New Zealand hoki stocks
from similar climate variables. New predictive models were developed using
updated data. Strong year classes of the western hoki stock were associated
with cooler SSTs, a negative SOI, and westerly or south-westerly flow along the
west coast of the South Island. We accordingly predict a moderately strong 1997
year class and weak 1998 and 1999 year classes for the western stock of hoki.
The current model cannot predict eastern stock year class strengths with
confidence.
Keywords hoki; recruitment; climate
New Zealand Journal of Marine and Freshwater Research, 2001, Vol. 35
M01014
Received 25 January 2001; accepted 4 May 2001
PDF file of entire paper: medium quality (864K); (scanned from paper original: notes about this process)
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