Table 2. --Toxicity of sodium cyanide to six species of freshwater fishes 



Species 



of 

 fish 



Number 



of 

 tests 



Number 

 of fish 

 per test 



Temp, 

 range of 

 diluent (°F.) 



pH range 



of 

 diluent 



Time required for 



100% mortality 



Minimum 

 (hours) 



Maximum 

 (hours) 



0.5 p. p.m. NaCN 



Green sunfish 

 Goldfish 



4 

 4 



76-79 

 76-82 



7.6-8.0 

 7.1-8.0 



4.1 



6.0 



1.0 p. p.m. NaCN 



Green sunfish 

 Largemouth bass 

 Yellow bullhead 

 Carp 

 Goldfish 

 Longnose gar 



17 

 4 

 3 

 2 

 2 

 2 



4 

 4 

 5 

 4 

 4 

 2 



54-80 

 74-80 

 76-80 

 79-80 

 78-79 

 73-74 



5.5-9.0 

 7.0-8.9 

 7.0-8.2 



7.3-7.5 

 7.2-8.7 

 7.3-7.8 



1.0 



0.7 



5.1 



5-8* 



5-8* 



3.3 



2.8 

 1.4 

 8-10* 

 8-14* 

 44-48* 

 4.2 



1.5 p. p.m. NaCN 



Green sunfish 

 Goldfish 



76-79 

 74-79 



7.5-7.6 

 7.1-9.0 



0.6 

 6.2 



0.7 

 20-24* 



* The exact time of 100 -percent mortality was not observed 



