Exposure to NO3–N for as long as 78 days had a significant effect
on mortality of B. gargarizans. Mortalities of groups exposed to the
control, 10, 50, or 100 mg/L NO3–N was 4.00 (±0.00)%, 4.67
(±0.67)%, 13.33 (±1.76)% or 24.67 (±0.67)%, respectively.
Mortalities of groups exposed to 50 or 100 mg/L were significantly
greater than mortalities of control groups, while no significant difference
was observed in 10 mg/L groups.