Abstract
Cercariae of Petasiger nitidus, shed from naturally infected Helisoma trivolvis, were maintained at various temperatures (4–35 °C), pH levels (5–9), and salinities (5 mg – 29 g NaCl/L). The optimal temperature for survival was 8 °C. Survival at 8 and 23 °C exhibited significant but low-magnitude variation with pH. The optimal salinity at 23 °C was 2.9 g NaCl/L; concentrations of 17.5 g/L or greater were lethal within 1 h. Cercariae tolerated a range of environmental conditions similar to that tolerated by their molluscan host, suggesting that survival of cercariae does not limit the geographical distribution of P. nitidus.
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