Abstract: Control of snail population is an important tool in fasciolosis control programme. In order to achive this objective the method of bait formulation containing an attractant and a molluscicide is an appropriate approach to ensure the death of host snail. Chlorophyllin bait pellets were prepared by addition of attractants starch (10 mM)/serine (20 mM) and Chlorophyllin 2% agar solution. These baits were used against host snail Lymnaea acuminata. The behavioral response of snail against attractant (starch/serine) and chlorophyllin was examined in red and sunlight. The fraction of snail that was in contact with chlorophyllin bait in zone-3 was used as measure of attraction process. Infected snails were more attracted with red light+starch (57.7%). Uninfected snails were more attracted by red light+serine (58.0%). The molluscicidal activity of chlorophyllin against infected snails in red light (96h LC50-1.88% chlorophyllin in bait) and sunlight (96h LC50-2.40% chlorophyllin in bait) was more pronounced than uninfected snail in red light (96h LC50-1.76% Chlorophyllin in bait) and sunlight (96h LC50-3.62% chlorophyllin in bait).