Figure 58. — Ocqueoc River sea lamprey weir and traps during opera- 

 tion in winter months. February, 19^49. (View from 

 downstream.) 



(2) The Carp Lake River dam and inclined - screen - trap 



for newly - metamorphosed sea lampreys 



The Carp Lake River, Emmet County, drains into the Straits of 

 Mackinaw on its southwest shore. The Carp Lake River proper, about 

 9 miles of stream course, arises in Carp Lake which is 1,823 acres 

 in extent. One small tributary. Mud Creek, drains into Carp Lake. 



A moderately large sea lamprey spawning run was observed in 

 this river in 19U7 and extensive spawning activity was noted. This 

 fact plus extensive areas of suitable larval habitat suggested that 

 the potential stock of downstream migrants might be large enough 

 to justify the construction of a trapping device. Subsequent oper- 

 ations indicated that the river was very productive of newly- 

 transformed sea lampreys. 



The tranping device selected for this experiment required the 

 construction of a dam. The lowest suitable site for this dam was- 

 about 1,500 feet above the mouth of the river; the stream was 32 

 feet wide at this point j very little spawning occurred below this 

 site in 19^7. 



- 156 - 



