UNITED STATES DEPARTMENT OF THE INTERIOR 



Walter J. Hickel, Secretary 



Fred J. Russell, Under Secretary 



Leslie L. Glasgow, Assistant Secretary 



for Fish and Wildlife and Parks 



U.S. FISH AND WILDLIFE SERVICE 

 Charles H. Meacham, Commissioner 



BUREAU OF COMMERCIAL FISHERIES 

 Philip M. Roedel, Director 



Laboratory Tests of an Electrical Barrier for 

 Controlling Predation by Northern Squawfish 



By 



GALEN H. MAXFIELD, ROBERT H. LANDER, 



and 

 CHARLES D. VOLZ 



United States Fish and Wildlife Service 

 Special Scientific Report—Fisheries No. 611 



Washington, D.C. 

 July 1970 



