Wild and cultured populations of the Pacific oyster, Crassostrea gigas, were analysed by starch gel electrophoresis for catalase (CAT). The comparison of genotypic frequencies at the Cat locus revealed an apparent advantage of heterozygotes in the wild and cultured populations.The observed frequency of heterozygotes in each population was higher than the expected frequency.This result suggests a case of balanced polymorphism.The genotypes of the Cat locus were associated with marked differences in early mortality during the cultured period.The survival rate of each homozygote was lower than the mean survival rate in the population.
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