New Zealand Journal of Marine and Freshwater Research abstracts

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SEASONAL REPRODUCTIVE CYCLE OF SNAPPER CHRYSOPHRYS AURATUS (FORSTER) IN THE HAURAKI GULF

James Crossland

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

Abstract Snapper was shown to be a serial spawner, producing many batches of eggs in one season. In 1974-75 the spawning season extended from October to January. In the non-breeding season the gonadosomatic index (gonad weight as a percentage of body weight) was less than 1.0. In the spawning season this rose to 6.1 in males, and to 6.9 in females. Histological studies showed oogonia present throughout the year, with the main period of production occurring after spawning. Primary eggs were always much more numerous than all other types. An egg cycle, from oogonium to ripe spawned egg, of 3-4 y was estimated. Developing eggs remaining in the ovary after spawning were resorbed.

N.Z. Journal of Marine and Freshwater Research 11 (/) : 37-60. March 1977
Received 25 February 1976; revision received 17 June 1976. Fisheries Research Division Publication 276.

PDF file of entire paper: medium quality (4189K); (scanned from paper original: notes about this process)

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