United States Department of the Interior 

 J. A. Krug, Secretary- 

 Fish and Wildlil'e Service 

 Albert M, Day, Director 



Special Scientil'ic Report - Fisheries 

 No. 3 



EFFECTS OF FEEDDJG DDT-SPRAYED IIBEGTS TO liRESH-WATER FBH 



By 



C. H. Hoffteann 



Bureau of Entomology- and Plant Quarantine, Agricultural Research Administration 

 U. S. Department of Agriculture, Beltsville, Maryland 



and 



£. W. Surber 

 Fish and Wildlife Service, United States Department of the Interior 



Kearneysville, Vfest Virginia 



CONTENTS 



Page 



Introduction 1 



Ifethods 1 



Consumption by the Bluegill of Insects Sprayed 



with DDT in Oil 2 



Consumption by Bluegills and Grapples of Insects 



Sprayed with a DDT Suspension 3 



Consumption by Largemouth Black Bass of DDT-Sprayed Insects .... 4 

 Consumption by Smal Imouth Black Bass of DDT-Sprayed Insects.... 7 

 Results of the Direct Feeding of V/ettable DDT in 



Gelatin Capsules . ,».i 8 



Effect of Condition on the Ability of Rainbow Trout to 



Withstand DDT 8 



Sunsnary and Conclusions .• 9 



Literature cited 9 



