United States Department of the Interior 

 J. A. Krug, Secretary- 

 Fish and Wildlil'e Service 

 Albert M. Day, Director 



Special Scientific Report - Fisheries 

 No. U 



EFFECTS OF VARIOUS 0ONCENTRATI)^S OF DDT 



ON SEVEKAL SPECIES OF FISH OF DIFFERENT SIZES 



By 



Eugene W. Surber 



U. S. Fish and Midlife Service, Kearneys ville , West Virginia 



and 



Clarence H, Hofffflann 



Bureau of Entomology and Plant Quarantine, Beltsville, Maryland 



CONTENTS 



Page 



Introduction. 1 



Methods 1 



Experiments with Young Fishes ••••• 2 



Suspensions *• 2 



Oil Formulations 7 



Suspensions and Oil Formulations .*.•....•••• 9 



Experiments with Older Fishes .11 



Suspens ions • 13 



Summary and Conclus ions • ...» .••* .18 



Literature Cited 19 



