UNITED STATES DEPARTMENT OF THE INTERIOR, STEWART L . UDALL, SECRETARY 

 Fish and Wildlife Seirvice, Clarence F . Pautzke, Commissioner 

 Bureau of Sport Fisheries and Wildlife, Daniel H . Janzen, Director 



SOME EFFECTS OF DDT ON THE GUPPY AND THE BROWN TROUT 



By 



Susan Frances King 



United States Fish and Wildlife Service 

 Special Scientific Report --Fisheries No. 399 



Washington, D. C, 

 March 1962 



