Kumar Navneet, Singh D K, Singh Vinay Kumar
Malacology Laboratory, Department of Zoology, D.D.U. Gorakhpur University, Gorakhpur, Uttar Pradesh 273009, India.
Scientifica (Cairo). 2016;2016:9795178. doi: 10.1155/2016/9795178. Epub 2016 Jan 27.
Fasciolosis is a waterborne disease, caused by Fasciola species. Snail Lymnaea acuminata is an intermediate host of these flukes. Control of snail population is major tool in reducing the incidences. Variation in light intensity and wavelength caused significant changes in reproduction pattern of snails. Maximum fecundity was noted with bait containing carbohydrate (starch, 468 ± 0.10/20 snails) or amino acid (serine, 319 ± 0.29/20 snails) as attractant. Sublethal feeding of chlorophyllin bait with starch or serine attractant to infected and uninfected snails caused significant reduction in fecundity, hatchability, and survivability. These significant changes are observed in snails exposed to different spectral band of visible light and sunlight. Maximum fecundity of 536 ± 2.0 and minimum of 89.3 ± 0.4 were noted in snails not fed with bait and exposed to sunlight and red spectral band, respectively. There was complete arrest in the fecundity of infected and uninfected snails and no survivability of uninfected snails after 48 h feeding with bait containing chlorophyllin + attractant. Minimum hatchability (9.25 ± 0.5) was noted in red light exposed, chlorophyllin + starch fed infected snails and hatching period of bait fed snails was prolonged. Conclusively, chlorophyllin bait and red light reduce reproduction capacity in snails.
肝片吸虫病是一种由肝片吸虫属引起的水传播疾病。尖膀胱螺是这些吸虫的中间宿主。控制螺类种群数量是降低发病率的主要手段。光照强度和波长的变化会导致螺类繁殖模式发生显著变化。以含有碳水化合物（淀粉，468±0.10/20只螺）或氨基酸（丝氨酸，319±0.29/20只螺）作为引诱剂的诱饵时，观察到最高繁殖力。用含有叶绿素铜钠盐诱饵并添加淀粉或丝氨酸引诱剂对感染和未感染的螺进行亚致死剂量投喂，会导致繁殖力、孵化率和存活率显著降低。在暴露于不同可见光光谱带和阳光的螺类中观察到了这些显著变化。未投喂诱饵且暴露于阳光和红色光谱带的螺类，分别观察到最高繁殖力为536±2.0和最低繁殖力为89.3±0.4。用含有叶绿素铜钠盐+引诱剂的诱饵投喂48小时后，感染和未感染螺类的繁殖力完全停止，未感染螺类无存活。在暴露于红光、投喂含有叶绿素铜钠盐+淀粉的感染螺类中观察到最低孵化率（9.25±0.5），且投喂诱饵的螺类孵化期延长。总之，叶绿素铜钠盐诱饵和红光会降低螺类的繁殖能力。
