Enzymatic activities of the New Zealand mudsnail, Potamopyrgus antipodarum, in freshly collected specimens and under two experimental conditions. Boxes represent 50% of enzyme activities, and whiskers are the total range of data. Enzymatic activities in specimens incubated for 10 days at 20 °C and 30 psu are significantly different from those at 0 psu for all three enzymes (*, p < 0.05, ANOVA, Tukey post hoc comparisons). All activities were measured at 20 °C.