New Zealand Journal of Marine and Freshwater Research abstracts

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FECUNDITY OF THE SNAPPER CHRYSOPHRYS AURATUS (PISCES: SPARIDAE) FROM THE HAURAKI GULF

James Crossland

Fisheries Research Division,
Ministry of Agriculture and Fisheries,
P.O. Box 19-062, Wellington, New Zealand

Abstract Fecundity estimates were made for snapper Chrysophrys auratus, a serial spawning fish, for the 1974-75 and 1975-76 spawning seasons. Weighed sub-samples of ovaries were used, and eggs were counted manually. All eggs >0.1 mm diameter were considered potentially capable of being spawned; estimates of these eggs were made at the beginning and end of spawning, and their difference was considered to be the actual fecundity. A log-log transformation of egg numbers against length offish gave a linear relationship. Fecundity estimates ranged from 297 000 at 25 cm to 4 528 000 at 50 cm eggs were also made, and batch sizes ranging from 13 000 at 25 cm to 104 000 at 50 cm were predicted. By combining these data with fecundity estimates the number of batches spawned was estimated to be 23-44 in 1974-75, depending on and increasing with length; and 6-59 in 1975-76.

N.Z. Journal of Marine and Freshwater Research 11 (4) : 767-75
Received 9 December 1976; received in final form 13 May 1977. Fisheries Research Division Publication 300.

PDF file of entire paper: medium quality (596K); (scanned from paper original: notes about this process)

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