MICHIGAN (Cont. ) 



rainbow trout through present control structures and to ascertain other effects 

 of control structures on fishes. 



Upper Peninsula; began 1955, continuing; $6,832; T. M. Stauffer, Leader. 



Address inquiries to: As in No. 3 above. 



45. Effect of Stream Improvement on Density of Trout Population 



The objective is to determine effects and merits of stream improvement 

 devices on population density and yield of trout in Pigeon River. Results before 

 and after installation of structures will be compared. 



Otsego County; began 1953, indefinite; $380; T. F. Waters, Leader. 



Address inquiries to: As in No. 3 above. 



46. Pool Construction as a Tool in Trout Management. 



Pools were dredged in Pigeon River. Population survey before and after 

 pool construction will help to determine results of this experiment. 



Otsego County; began 1953, to close 1957; $380; T. F. Waters, Leader. 

 Address inquiries to: As in No. 3 above. 



47. Population Manipulation, Big Bear Lake 



Through netting control abundance of white sucker. The effects of this 

 modification of population structure will be followed by nnark-and- recapture 

 estimates. 



Otsego County; began 1940, continuing; $380; Walter R. Crowe, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



48. Fish Population Control by Partial Kill 



The objective is to determine effects of reduction in nximbers of pan fish 

 by poisoning. Growth rates, yields, and changes in population structure are 

 examined. 



Fifteen lakes; began 1949, to close, 1961; $10, 628; J. E. Williams, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



49. Relative Survival of Brown Trout and Rainbow Trout Planted in Spring or Fall 



The objective is to determine results by planting equal numbers of each 

 species in spring and fall. Results are based on creel census data and popu- 

 lation surveys. 



Four trout streams; began 1951, continuing; $11,387; D. S. Shelter, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



50. Relative Survival of Wild Versus Hatchery-reared Fingerling Trout 



Equal numbers of fingerlings are ntiarked and the results are determined 

 by creel census and population surveys. 



Pigeon River; began 1951, closed 1956; $1, 518; T. F. Waters, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



51. Walleye Sport Fishery Management 



Introductions of walleye fingerlings are made in selected lakes on an in- 

 troductory or maintenance basis. Results followed by random creel census 

 and netting. 



Forty-three lakes; began 1951, continuing; $380; Walter R. Crowe, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



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