MICHIGAN (Cont. ) 



51. Water Level Control, South Twin Lake. 



Determine effect of raised water level in a shallow lake by befor e-and-after compari- 

 son of growth and general abundance of fish population. 



South Twin Lake, Cheboygan County; began in 1947, to be completed in 1953; Walter 



R. Crowe, Proj. Ldr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



52. Lower Gamble Creek Weirs. 



By tagging in late fall and early spring, observations are conducted on the nature of 

 spawning run of brown trout and other species from Devoe Lake and Rifle River 

 through Gamble Creek and diversion. Also the species composition, numerical 

 abundance, and age and growth of weir catch over a period of years are recorded. 



Waters in Rifle River Area; began October 1952, indefinite; $377; Howard Gowing, 



Proj. Ldr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



53. Bluegill-Trout Relationship in Ford Lake. 



The competition for food between trout and bluegills; growth rates of both species; 

 length of time necessary for bluegills to become stunted and assume dominant 

 position; possible introduction of a predator species as a control; poisoning and 

 population analysis are under investigation. 



Ford Lake, Otsego County; began in 1949, planned for completion in 1953; $551; 



Robert C. Ball, Proj. Ldr. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



54. Black River Lamprey - Rainbow Trout Research. 



In conjunction with operation of the Black River barrier to block spawning run of sea 

 lampreys, studies are being conducted to find its effectiveness as a barrier to 

 rainbow run. A management program is being developed for the rainbow run 

 based on age and growth studies, observations on extent of spawning above bar- 

 rier, and exploitation by anglers. 



Black River, Mackinac County; began in 1946, continuing; $3,886; Thomas M. 



Stauffer, Proj. Ldr. ; reports available. 

 Address correspondence to: Institute for Fisheries Research, Univ. Museums 



Annex, Ann Arbor, Mich. 



55. Beaver -Trout Relations. 



By collection of physical, chemical, and biological data, the project expects to 

 determine effects of beaver on Michigan trout streams, and establish manage- 

 nnent procedures on a sound factual basis. 



50 



