New Zealand Journal of Marine and Freshwater Research abstracts
Movement of hapuku (Polyprion oxygeneios) determined from tagging
studies
M. P. BEENTJES
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 6414
Dunedin, New Zealand
email: m.beentjes@niwa.cri.nz
M. P. FRANCIS
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 14 901
Wellington, New Zealand
Abstract Hapuku (
Polyprion oxygeneios) were tagged in
south-east South Island (SESI), Cook Strait (CS), and Poor Knights Islands
(PKI), New Zealand, to determine their movements. 1623 fish were tagged and the
overall recapture rate was 16.3%. Some hapuku were recaptured from the tagging
sites (SESI 13%, CS 39%, PKI 40%), often after long periods at liberty, whereas
others travelled substantial distances. The greatest distance travelled was
1389 km (by two fish) and the maximum period at liberty was 10.2 years.
SESI hapuku tended to migrate northwards towards CS. The median distance
travelled increased with hapuku length at recapture, suggesting that maturation
and spawning stimulate migration. However, some of the smaller, immature hapuku
also travelled several hundred kilometres. CS hapuku appeared to travel much
shorter distances than SESI hapuku, but this may have been an artifact of the
lower hapuku fishing effort outside the CS-Kaikoura region. PKI hapuku showed
very limited movements, and no interaction with CS or SESI fish. The results
are consistent with the presence of a single stock in the SESI-CS region, and
possibly a separate stock in northern New Zealand.
Keywords hapuku; Polyprion oxygeneios; tagging;
movement; stocks
M98026
Received 27 May 1998; accepted 19 October 1998
PDF file of entire paper: medium quality (711K); (scanned from paper original: notes about this process)
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