New Zealand Journal of Marine and Freshwater Research abstracts

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Genetic and meristic variation in black and smooth oreos in the New Zealand Exclusive Economic Zone

P. J. Smith
P. J. McMillan
B. Bull
S. M. McVeagh

National Institute of Water and Atmospheric Research Limited
P.O. Box 14 902
Wellington, New Zealand
email: p.smith@niwa.cri.nz

P. M. Gaffney

College of Marine Studies
University of Delaware
Lewes
DE 19958, United States

S. Chow

Division of Pelagic Fish Resources
National Research Institute of Far Seas Fisheries
Orido 5-7-1, Smimizu
Shizuoka 424, Japan

Abstract   Meristic and genetic methods were used to determine the stock relationships of black Allocytus niger (James, Inada & Nakamura, 1988) and smooth oreo Pseudocyttus maculatus (Gilchrist, 1906) in the New Zealand Exclusive Economic Zone (EEZ). Samples were collected from four management areas-OEO 1 (south-west), OEO 3A (Chatham Rise west), OEO 4 (Chatham Rise east), and OEO 6 (subantarctic) during the 1998 October-December spawning period. Lateral line scale counts and pyloric caeca counts revealed differences between black oreo samples from OEO 6 and the other three OEO management areas. Lateral line scale counts in smooth oreo showed no significant differences between areas. Genetic analyses of four non-coding regions of nuclear DNA and mitochondrial (mt) DNA haplotypes in black oreo showed no significant differentiation among the four management areas. Likewise for smooth oreo, genetic analyses of five non-coding regions of nuclear DNA and mtDNA haplotypes showed no overall regional differentiation, although there was weak evidence at one locus for a difference between OEO 3A and OEO 6. The data do not reject the null hypothesis of a single genetic stock in New Zealand waters, and are typical of marine species with long pelagic juvenile stages.

Keywords   oreo; Allocytus niger; Pseudocyttus maculatus; DNA introns; mitochondrial DNA; meristics; stock discrimination

M02028 Received 19 April 2002; accepted 7 August 2002; Published 14 November
New Zealand Journal of Marine and Freshwater Research, 2002, Vol. 36: 737-750
0028-8330/02/3604-0737 $7.00 © The Royal Society of New Zealand 2002

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