Seasonal reproductive cycle of snapperChrysophrys auratus(Forster) in the Hauraki Gulf

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Abstract
The seasonal reproductive rhythm of the snapper Chrysophrys auratus (Forster), was studied from November 1973 to April 1975. Methods used were to analyse gonad maturity stages, gonad weights, and ovarian egg sizes. The histology of the gonads was also studied. 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.

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