a 1 d delay in comparison to those in the presence of NaCl. By
the end of the bioassay, P. perezi larvae from DNP presented between 0.0% and 0.1% mortality in treatments with 0 or 5 mg L1N–NO2 , at the different concentrations of NaCl. 100% mortality in the 150 treatment occurred after 13 d of exposure, thus resulting in a significantly different effect of this treatment in comparison to
all others (post-hoc Tukey test). Concentrations of 2 and 0.4 g L1 NaCl reduced this mortality rate to practically zero.