New Zealand Journal of Marine and Freshwater Research abstracts

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Movement patterns of rig (Mustelus lenticulatus) tagged in southern New Zealand

MALCOLM P. FRANCIS

Fisheries Research Centre
Ministry of Agriculture and Fisheries
P.O. Box 297, Wellington, New Zealand

Abstract Rig (Mustelus lenticulatus) were tagged around the South Island and south-west North Island to determine movement patterns and stock distributions. Recaptured females travelled further than males, and off the east coast of the South Island mature females travelled further than immature females. No seasonal differences were found in the direction or distance travelled. The greatest displacement velocity recorded for a tagged rig was 21 km/day, but few travelled faster than 7 km/day. Over half the recaptured rig travelled > 50 km, and 52% of the females travelled > 200 km. The greatest recorded movement was 1159 km. Male stocks have a small range and may overlap considerably with each other. Separate stocks of females exist on the east and west coasts of the South Island, but some overlap occurs. The relationship between the annual movement patterns of rig, and the annual reproductive cycle is discussed. Available data are insufficient to determine why rig aggregate annually in shallow coastal waters.

Keywords rig; Mustelus lenticulatus; tagging; movement patterns; stocks; interaction rate

New Zealand Journal of Marine and Freshwater Research, 1988, Vol. 22 : 259-272 ; Crown copyright 1988Received 21 May 1987; accepted 16 September 1987

PDF file of entire paper: medium quality (1025K); (scanned from paper original: notes about this process)

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