Fig. 1

DDVP exposure reduces cholinesterase activity in brain and heart. Hearts and brains from four control and four exposed fish were assayed for cholinesterase activity by the Ellman method. Data are presented as percentages of unexposed control. All exposed conditions differed from control at the p ≤ 0.05 level using the Kruskal-Wallis test. Error bars represent the standard error of the mean (SEM)