A random sample of 150 individuals of a laboratory-produced cohort of Ostrea chllensis Philippi, 1845 was taken at 10 and 36 mo of age to estimate physiological variables and individual heterozygosity uslng 4 loci (Lap, Pgi, Pgm and Ca). Juveniles of 10 mo of age showed a mean Dvalue of 0.134 (p > 0.05) and a positive correlation between oyster size and multiple-locus heterozygosity (MLH) (p < 0.05). Also, there was a positive correlation (p < 0.05) between ingestion rate, absorption rate and MLH. A negative correlation between excretion rate (p > 0.05), oxygen consumption rate (p < 0.05) and MLH was found. The K2 value (standardized net growth efficiency) was positively correlated (p < 0.05) with MLH. At 36 mo a heterozygote deficiency was present with a mean value D = -0.431 (p < 0.05). No relationship between standard dry weight and MLH and also a negative correlation between the scope for growth and MLH were found. The oxygen consumption and excretion rates also showed an ~n -crease in large size individuals. The slopes for f~ltration and excretion rates against MLH were negative and not statistically slgnif~cant. However, ingestion and absorption rates showed significant (p < 0.05) decrease with an increase in heterozygosity. The results seem to indicate that within sexually immature individuals of 0. chilensls, a positive correlation between growth rate and MLH can be found, while in adults the higher energy allocation for reproduction precludes the detection of this relationship.
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