United States Department of the Interior, Oscar L. Chapman, Secretary 

 Fish and Wildlife Service, Albert M. Day, Director 



USE OF ELECTRICITY IN THE CONTROL OF SEA LAMPREYS: 



ELECTROMECHANICAL WEIRS AND TRAPS 



AND ELECTRICAL BARRIERS 



by 



Vernon C. Apple gate and Bernard R. Smith 



Fishery Research Biologists 

 Great Lakes Fishery Investigations 



and 



Willis L. Nielsen 



Electronic Engineer 



Cook Research Laboratories 



Division of Cook Electric Company 



Special Scientific Report: Fisheries No. 92 



