Fig. 10. Summarized effects of putative transmitters and respective analogues on swimming behaviour, expressed as the average percentage of larvae in the top of the water column. Tested compounds included serotonin (10^-4 mol l^-1 to 10^-6 mol l^-1), fluoxetine and mianserin (both at 10^-5 mol l^-1), dopamine and norepinephrine (both from 10^-4 mol l^-1 to 10^-6 mol l^-1), haloperidol, alprenolol and spiperone (all at 10^-5 mol l^-1). Asterisks indicate significant difference when compared with the control group (P<0.05).