Chronic Toxicity of Hydrogen Cyanide to the Bluegill

Abstract
The bluegill, Lepomis macrochirus Rafinesque, was subjected to various concentrations of HCN to determine the effects on long-term survival, growth, egg production and egg hatchability. Intermittent-flow experiments were conducted using adults, juveniles and newly hatched eggs in separate tests. Egg production was most sensitive to HCN, and the highest concentration with no adverse effect was below 5.2 .mu.g/l HCN. Fry survival through the first 6 wk followed in sensitivity with the no-adverse-effect level occurring between 15.6-19.4 .mu.g/l HCN.