Conroy & Pankhurst--Size-fecundity relationships in oreos

New Zealand Journal of Marine and Freshwater Research abstracts

Size-fecundity relationships in the smooth oreo, Pseudocyttus maculatus, and the black oreo, Allocyttus niger (Pisces: Oreosomatidae) (Note)

ANNE M. CONROY

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

NEVILLE W. PANKHURST

Leigh Marine Laboratory University of Auckland R. D. Leigh, New Zealand

Abstract Fecundity estimates were made from 72 smooth oreo (Pseudocyttus maculatus Gilchrist, 1906) and 77 black oreo (Allocyttus niger James, Inada & Nakamura, 1988) with oocytes in late vitellogenesis, captured from the south Chatham Rise during November 1986. Absolute fecundities ranged from 6000 to 84 000 for smooth oreo and 5000 to 62 000 for black oreo, with relative fecundities of 10 800 and 17 500 eggs per kg body weight for smooth and black oreos, respectively. Both species have absolute and relative fecundities within the same order of magnitude as orange roughy, but one to two orders of magnitude lower than six other commercially exploited fish species from the New Zealand continental shelf or slope region. The comparatively low fecundity of the oreo species could contribute to susceptibility to overfishing.

Keywords fecundity; oreos; fish eggs; Oreosomatidae

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