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Periods of survival of rainbow trout in concentrations of un‐ionized ammonia in the range 0.86‐1.96 parts per million of nitrogen increased as the concentration of dissolved oxygen was raised from 1–5 to 8‐5 p.p.m. At each concentration of dissolved oxygen the period of survival decreased as the concentration of un‐ionized ammonia increased from 0.86 to 1.96 p.p.m. The effect of oxygen in increasing survival time was greater in the lower concentrations of un‐ionized ammonia.
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Downing et al. (1955) studied this question.
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