Abstract
Treatment with cytochalasin B has been used to induce triploidy. During 2 years of culture in the sea, periodic measurements in Group I (treated by blocking meiosis I) and in Group II (treated by blocking meiosis II) have shown: (1) In juveniles the measurements of size and weight in triploids in Group I were significantly higher than those of diploid siblings ( P<0.001) but the difference in Group II was not significant. (2) In adults the measurements of size and weight of triploids in both groups were significantly higher than those of diploid siblings ( P<0.001). (3) During reproductive seasons, the daily growth rates of shell height and body weight of triploids were higher than those of diploid siblings in both groups, but in most months of nonreproductive seasons there were no differences. Gonad development in triploids was abnormal. During reproductive seasons, the gonads of most triploids remained at the inactive or proliferation stages, and only a few of them reached the growth stage. Comparative study on heterozygosities of three gene loci between triploids and diploids showed no positive relationship between the number of heterozygous loci and the size measurements in either group. Results suggest that the faster growth rate of triploid adults is caused by the retarded development of gonads in triploids.
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