Survival Rainbow trout mortality began to increase for the high NO3-N treatment only 1-week after treatments were initiated (Fig. 3).Thereafter, cumulative survival was consistently lower for the highNO3-N treatment for the remainder of the study (Fig. 3). Over thefinal 2–3 weeks of the study rainbow trout mortality increased forboth groups but was more severe within the high NO3-N treat-ment (Fig. 3). At the conclusion of the study, cumulative rainbowFig