CONTENTS 



Page 



Introduction 1 



Materials and Methods 3 



Bioassays with the guppy 3 



Bioassays with young brown trout 5 



Histological study of trout fry and adult 



guppy tissues following exposure to DDT .... 6 



Results 6 



Bioassays with the guppy 6 



Bioassays with young brown trout 8 



Hi sto pathological condition of trout fry and adult 



guppy tissues following exposure to DDT .... 9 



Discussion 10 



Evaluation of bioassay data 10 



Histopathological conditions 12 



Summary and Conclusions 14 



Literature Cited 15 



Explanation of Figures 20 



