Special Scient,ific Repori. - Fisheries 

 No. 68 



SEA LAMPREY SPACING RUNS IN THE GREAT LAKES, 1951 



By 



Vernon C. Applegate_, Bernard R, Smith, and 

 Alb er ton Lo McLain 

 Fishery Biologists 



and 



Matt Patterson 

 Super^i/isor, Comnercial Fishing 

 Wisconsin Conservation Department 



UONTENTc 



Page 



Installation and operation of sea laxaprey 



control structures in 1951 <, . 1 



Lake Huron ^ ......... o ......... . 1 



Lake Michigan ,,,.........,. U 



Lake Superior .,.......,.,. U 



Numbers of lampreys taken by control devices It 



Relative abundance of sea laimpreys . . . , . 5 



Lake Micl'dgan ,.,..,..........,... 5 



Lake ijupc'-.^c.'r , ... ^ .,.........,.<, . b 



Other species of fish taken in the weirs and traps and 



degree of scarring among them, «...,,... 9 



Some biological char-acteristics of the sea lamprey runs. . 9 

 New developments and further evaluation of mechanical 



control devices, . , . o . . c 31 



Barrier dams. .............. 31 



Portable-type weirs and .traps ............ 33 



Operating costs in 19pO and 1951™ ..... 33 



Literature cited „.,„....,......,..... 36 



List of common arid fr-cientlfic names of fishes mentioned 



in this report .,.,.,,...... 37 



