TABLES 



Section Page 



3 Acute toxicity of six candidate forest insecticides to 

 brook trout in water of different temperature, hardness, 

 and pH 15 



3 Acute toxicity (96-h LC50 and 95% confidence intervals, 



mg/1 ) of six candidate forest insecticides to mature scuds 



and stonefly naiads tested at 18 °C and 16 °C 20 



3 Effect of PCB (Aroclor 1254) residues on sensitivity of 



brook trout to candidate forest insecticides 23 



3 Effect of DDT residues on sensitivity of atlantic salmon 



to a mixture of guthion and dylox 24 



3 Effect of PCB (Aroclor 1254) residues (total body) on 



sensitivity of brook trout to four forest insecticides . . 25 



5 Analysis of well water used in bioassays 40 



5 Survival and weight of first-generation fathead minnow 

 after 28 days, 56 days, and 84 days of exposure to 

 hydrogen cyanide 43 



5 Egg production, egg survival and terminal weights of 

 first-generation adult fathead minnows exposed to 

 various concentrations of cyanide 44 



5 Survival, length and weight of fathead minnow after 28 



days and 56 days of exposure to hydrogen cyanide 46 



5 Egg production of adult brook trout exposed to HCN 144 



days before start of spawning 47 



5 Percentage survival of brook trout eggs and alevins ex- 

 posed to various levels of HCN 49 



5 Growth of brook trout alevins from hatch to 90 days ex- 

 posed to various levels of HCN 51 



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