New Zealand Journal of Marine and Freshwater Research abstracts
Occurrence of hoki (Macruronus novaezelandiae) eggs and larvae in eastern Cook Strait
ROBIN C. MURDOCH
BRUCE E. CHAPMAN
New Zealand Oceanographic Institute
Division of Water Sciences
Department of Scientific and Industrial Research
Private Bag, Kilbirnie
Wellington, New Zealand
Abstract The presence of planktonic eggs and larvae of hoki
(Macruronus novaezelandiae) in the Cook Strait region is recorded for the first time. Maximum hoki egg density found in samples collected from Cook Strait in September 1986 was 6813 per 100 m
3. This is higher than egg densities recorded from the west coast South Island hoki spawning area. Most (95%) of the eggs were 1.5-3.0 days old. Maximum density of hoki larvae was 474 per 100 m
3, with greatest recorded abundance in the 20-40 m depth range. Most of the larvae were over 5 days old. Depth and current considerations suggest that the seafloor canyons in eastern Cook Strait (Nicholson, Wairarapa, and Cook Strait Canyons) are likely spawning areas. The possibility that spawning of hoki in Cook Strait has occurred previously is discussed.
Keywords hoki; Macruronus novaezelandiae; eggs; larvae; Cook Strait; New Zealand
New Zealand Journal of Marine and Freshwater Research, 1989, Vol. 23: 61-67 0028-8330/89/2301-O061$2.50/0 © Crown copyright 1989 Received 11 February 1988; accepted 27 June 1988
PDF file of entire paper: medium quality (559K); (scanned from paper original: notes about this process)
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