Controlling the snail intermediate host of schistosomiasis is one of the strategies used to reduce disease incidence. In this study screening tests were carried out on the action of dried powder of eight algal species against Biomphalaria alexandrina snails. The most effective powders were from Dictyota dichotoma and Cystoseira barbata with LC₅₀ values of 560 and 2200 ppm, respectively. Prolonged exposure to sublethal concentrations of these two powders caused adverse effects on snails' reproduction especially at LC₂₅. Hatchability of exposed eggs was lowest at LC₂₅ of C. barbata, and LC₁₅ of D. dichotoma. The most pronounced effects on the hermaphrodite gland of snails were caused by high concentrations of both algal suspensions, where ova were either degenerated or deformed and there were detrimental effects on all spermatogenesis stages. The electrophoretic separation of haemolymph proteins showed that the concentration with most effect was the LC₁₅ for both tested algae as they resulted in more bands than the control and also an elevation in total protein content.

控制蜗牛的血吸虫病中间宿主是减少疾病发生率的策略之一。在这项研究中，针对八种藻类的干粉对Biomphalaria alexandrina蜗牛的作用进行了筛选测试。最有效的粉末来自Dictyota dichotoma和Cystoseira barbata，LC ₅₀值分别为560和2200 ppm。长时间暴露于这两种粉末的致死浓度会对蜗牛的繁殖产生不利影响，尤其是在LC _25下。暴露卵的孵化率在LC最低₂₅的C.半枝莲，和LC ₁₅的芒萁。对蜗牛的雌雄同体腺最明显的影响是由于高浓度的两种藻类悬浮液引起的，在这些悬浮液中卵子要么退化要么变形，并且在所有精子形成阶段都受到有害影响。电泳分离的血淋巴蛋白显示，对两种测试藻类而言，影响最大的浓度均为LC ₁₅，因为它们比对照产生更多的条带，并且总蛋白含量也增加。