For cercarial activity and survival infected periwinkles were acclimated for three weeks under the different treatments (n=10 individuals per treatment) and incubated to allow for cercarial release. At the start of the experiment, approximately 45 cercariae per treatment were added individually to wells of three 96-well plates The 96-well plates were then exposed to the different temperature treatments placing them in the six thermobaths (three 96-well plates per treatment combination). Activity and survival were then assessed under a stereomicroscope after 4, 6, 9, 18, 27, and 45 hours. Cercariae were considered fully active when they were constantly swirling around (category: fully active). When laying at the bottom and not reacting, these were considered dead (category: dead), when still reacting, even if slowly, these were still considered alive (category: alive). This last category included "fully active".