Abstract

To elucidate the reproductive activity of the Yesso scallop Mizuhopecten yessoensis (Jay, 1857) in polluted Amur Bay (Peter the Great Bay, Sea of Japan), the seasonal patterns of growth of its gonad, adductor muscle, and digestive gland were studied. As the results of this study have shown, spawning in this polluted bay leads to a decrease in the weight of not only the gonads, but also the adductor muscle, and the digestive gland of scallops, which suggests that the energy spent for gametogenesis is provided, in particular, by the energy reserves of these somatic tissues. It has been found that in the years of heavy pollution of these waters, the decrease in the weight of the organs of the scallop for first gametogenesis was insignificant during the spawning period, which indicates the incomplete contribution of first-time spawning two-year-old individuals to reproduction of the population. With a decrease in the level of environmental pollution, two-year-old scallops show a significant loss in the weight of their gonad and somatic tissue during spawning; i.e., they undergo successful spawning. In the period of sexual maturity, the annual increment of somatic tissues decreases with age, but the reproductive activity increases, subsequently decreasing in the senile stage of the life history of the scallop.

中文翻译：

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污染的阿穆尔湾野贝扇贝的体细胞和生殖生长

摘要

阐明野扇贝Mizuhopecten yessoensis的生殖活性（Jay，1857年）在被污染的阿穆尔湾（日本海彼得大帝湾）中，研究了其性腺，内收肌和消化腺的季节性生长模式。研究结果表明，在受污染的海湾产卵不仅可以减轻性腺的重量，还可以减轻内收肌和扇贝的消化腺的重量，这表明提供了用于配子发生的能量尤其是通过这些体细胞组织的能量储备。已经发现，在这些水域的严重污染的年份中，产卵期扇贝的初生配子体器官重量的减少是微不足道的，这表明首次产卵两年的产卵量不大。老年个体向人口繁殖。随着环境污染水平的降低，两年大的扇贝在产卵期间显示出其性腺和体细胞组织的重量显着减少。即它们经历了成功的产卵。在性成熟期，体细胞的年增量随着年龄的增长而减少，但生殖活动却增加了，随后在扇贝生活史的老年期逐渐减少。