Snails infected by trematodes may increase or decrease their reproductive activity in response to the presence of infection. Our aim was to verify the reproductive alterations in Subulina octona after infection by Paratanaisia bragai. The infected snails were individually exposed for 24 hours to 20 parasite eggs and four groups were formed (10, 20, 30 and 40 d.p.i.- days after infection), along with control groups. Every 10 days, the number of eggs in the reproductive tract, number of eggs hatched, galactogen content and histopathological changes were evaluated. The reproductive in the control and infected snails presented an alternating pattern, where periods of high production of eggs and newly hatched were followed by periods of low production. However, in relation to the amount of galactogen, both control and infected groups followed the same pattern of variation. In the histology, we observed the presence of male and female gametes with marked reduction in the number of oocytes. The results indicate that the intra-snail development of the parasite affects the reproductive biology of the host.

中文翻译：

---

评价实验性感染了巴西梧桐（Digenea，Eucotylidae）的辛通子（Gastropoda，Subulinidae）的繁殖情况

受吸虫感染的蜗牛可能会根据感染的存在而增加或减少其生殖活性。我们的目的是验证被Paraparaisia bragai感染后辛辛那拉（Subulina octona）的生殖变化。将感染的蜗牛分别暴露于20个寄生虫卵24小时，并与对照组形成4组（感染后10、20、30和40 dpi天）。每10天评估一次生殖道中的卵数，孵出的卵数，半乳原含量和组织病理学变化。对照和受感染的蜗牛的生殖呈交替模式，卵高产和刚孵化的时期随后是卵低产的时期。但是，关于半乳原的量，对照组和感染组都遵循相同的变异模式。在组织学中，我们观察到雌雄配子的存在，卵母细胞数量明显减少。结果表明，寄生虫在蜗牛体内的发育会影响宿主的生殖生物学。