MICHIGAN (Cont. ) 



of using an electric screen for walleyes, and magnitude and exploitation of spawn- 

 ing run. Most of these data are secured from tagging studies. 



Lower Muskegon River system, from Big Rapids Reservoir to Lake Michigan; 

 began April 1947, continuing; $377; Walter R. Crowe, Leader; reports available. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



39. Life History of Black Crappie. 



A synthesis of earlier studies on the species is being compiled through library 

 research and investigations of lesser known facts concerning it by studies on 

 growth, habits, and ecology. 



Duck Lake, Calhoun County and other waters; began February 1950, contin- 

 uing; $1,160; K. E. Christensen, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



40. Smallnnouth Bass in the Geat Lakes Water of Michigan. 



Intensive investigation through study of ecology, exploitation, and distribu- 

 tion is conducted to set up the conservation and management program for the 

 smallmouth bass. 



Statewide, Great Lakes waters; began 1953, continuing; $3,861; A. S. Hazzard, 

 Karl F. Lagler (Universith of Michigan), Leaders. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



41. Brook Trout and Brown Trout Fishing Regulations. 



The project is designed to test the effect of higher size limits and bait re- 

 strictions on angling quality for brook and brown trout. 



North Branch AuSable River, Crawford and Otsego Counties; began 1949, 

 continuing; $1,782; D. S. Shetter , Leader; reports available. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



42. Experimental Fishing Regulations on Lakes. 



Creel census, age, growth, and population studies are being used to de- 

 termine the effect of relaxed fishing regulations on 14 "experimental" lakes. 



Fourteen selected lakes; began April 1951, planned for 8 years; $38, 313; 

 K. E. Christensen, Leader; reports available. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



43. Control of Fish Population by Partial Kill. 



The objective is to determine effect of lowered population density on growth 

 rates before and after poisoning. 



Various waters of the State, especially Sand Lake, Newaygo County; began 

 1949, continuing; $2, 376; J. E. Williams, Leader. 



Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



44. Water Level Control, South Twin Lake. 



Determine effect of raised water level in a shallow lake by before-and- 

 after comparison of growth and general abundance of fish population. 



Cheboygan County; began 1947, to close 1954; Walter R. Crowe, Leader. 

 Address inquiries to: Institute for Fisheries Research, as in No. 1 above. 



45. 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 composi- 

 tion, numerical abundance, and age and growth of weir catch over a period of 

 years are recorded. 



49 



