The three experiments conducted to spawn and grow C. Gigas were only partly successful, with total mortality of larvae occuring in 14 days: spawning and larvae growth to this period being successful on each occasion. Further experiments in an attempt to determine the reason for failure using the species O. Angasi resulted in settlement and successful ongrowing of large numbers of this oyster: up to 25mm before removal to the sea. It would appear, therefore, that insuffic­ient food was not the cause of larvae mortality with C. Gigas. It is assumed that the drop in pond temperature overnight was responsible for larvae mortality. It is suggested that some method of heat reten­tion overnight could result in the successful rearing of C. Gigas in ponds.

Processors have asked for supplies of O. Angasi to market as a complimentary product to C. Gigas. Success with the production of this oyster by a very cheap method of rearing and growing in ponds warrants further work in this field.