PREFACE 



This volume contains the papers presented at the Third US-USSR Symposium 

 on the Effects of Pollutants on Aquatic Ecosystems entitled, "Theoretical 

 Aspects of Aquatic Toxicology". All of the papers were presented in English 

 or Russian with simultaneous translations into the corresponding language at 

 Borok, Jaroslval Oblast, USSR during July 2-6, 1979, at the Institute for 

 the Biology of Inland Waters of the USSR Academy of Sciences. 



Professor N.V. Butorin, Director of the Institute and Project Leader for 

 the Soviet side, served as official host for the American delegation and has 

 assumed the responsibility for the publication of these proceedings in the 

 Russian language. This joint bilingual publication represents a reaffirma- 

 tion of the continuing commitment pledged by both countries to cooperative 

 environmental activities. 



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