The Influence of Dissolved Oxygen Concentration on the Toxicity of Potassium Cyanide to Rainbow Trout

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Abstract
1. Survival times of rainbow trout in concentrations of potassium cyanide in the range 0.105-0.155 p.p.m. cyanide increased with increase in dissolved oxygen concentration between 10 and 100 % of air saturation value, the effect being most marked with the lowest concentration of cyanide. 2. The rate of increase of survival time with increasing concentration of oxygen did not appear to fall off as air saturation value was approached. 3. The distributions of survival times which had median values of 3.3 min. or less were approximately normal, and those with median values of 13.0 min. or more were approximately log-normal.