三倍体僧帽牡蛎生殖腺发育观察

在僧帽牡蛎繁殖盛期，详细观察了二倍体，三倍体僧帽牡蛎生殖腺外部形态特征，比较了成熟卵母细胞卵径和核径。结果表明，外观上三倍体生殖腺发育较二倍体差，三倍本成熟卵母细胞卵径和核径分别比地倍体大１９．６％和１７．６％，体积分别比二倍体增加７０．３％和６４．２％，组织切片检查结果，二倍体生殖腺发育正常，三倍体生殖腺发育受阻，大都在增殖期和休止期，一部分个体可发育至生长期和成熟期，并能产生成熟的卵子和精子，

OBSERVATION ON GONADAL DEVELOPMENT IN TRIPLOID OSTREA CUCULLATA

During the peak period of its reproduction,external morphylogical features of gonad were under careful observation for diploid and triploid oyster,Ostrea cucullata, and with a comparison of mature oocytes and their nuclei in size. The results revealed that gonad in triploids showed poor development relative to diploids by appearances, the diameter of mature oocytes and their nuclei of triploids were 19.6% and 17.6% larger than those of diploids,and with 70.3% and 64.2% larger in volume.Histological sections presented that unlike diploids, gonadal development was retarded in triploids, of which the majority remained in stages of proliferation and spent,and only some of them developed to growth and mature stages and produce mature oocytes and sperm. Three hermaphrodites were observed in triploids sampled, which the sex ratio was female 7:male 1. In addition,retardation of gonadal development and hermaphroditic phenomenon of triploids are discussed in this paper.