Section page 



8 Freshwater Fishes Recommend for Collection for Tissue 

 Contaminant Residue Determinations (NPMP), Listed by 

 Category, Habitat and Species 101 



8 Contaminant Residues Measured and Detected in NPMP 



Freshwater Fish Samples, 1967 Through 1976-77 102 



8 Geometric Mean Residues of Organochlorine Compounds at 



74 Selected NPMP Stations, 1970-1976/77 105 



8 Percentage of 74 NPMP Stations Where Detectable Residues 

 of Important Organochlorine Compounds Were Found, 1970- 

 1976/77 106 



n Daphnia Magna Relationships of Percent Mortality in 

 Daphnia Magna , as Calculated by Various Equations, 

 With Duration of Experiment 141 



11 The Correlation of Experimental and Calculated Relation- 

 ships Between Mortality and Duration of Exposure of 

 Daphnia Magna to Trimethyl Tin Chloride Using Various 

 Equations 146 



11 The Date of Death of 25 Percent of Daphnia Magna Exposed 

 to Various Compounds as Calculated From Experimental 

 Studies of Varying Duration 147 



11 The Relationship of the Time of Death of 25 Percent of 

 Daphnia Magna with Concentrations of Trimethyl Tin 

 Chloride Calculated by Different Functions 151 



11 Acceptable Concentrations of Compounds for Survival of 

 Daphnia magna Calculated with Equations of Power 

 Function 152 



13 Morphometric Results of Nutrient Treatments 182 



14 Reversibility of Intoxication Caused by Effluents in 



Juvenile Salmons 190 



14 Reversibility of Intoxication in Juvenile Salmon During 



Four Exposures to Effluents Diluted in a Ratio of 1 :1 . . 193 



14 Reversibility of Intoxication in Perch Caused by 



Effluents 196 



14 Reversibility of Intoxication in Juvenile Salmon Caused 



by Effluent From a Heat-and-Power Station 197 



XV 



