MICHIGAN (Cont. ) 



37. Census, Rifle River Area 



From records of all angling, angling pressure is determined and trends 

 in angling quality for the whole area are noted. 



Rifle River Fisheries Research Area; began 1945, continuing; $11, 387; 

 Mercer H. Patriarche, Leader; reports available. 



Address inquiries to: As in No. 3 above. 



38. Creel Census, Hunt Creek 



By securing records of all fishing on the experimental area, trends in 

 angling pressure and success are followed. Creel census results are used to 

 evaluate the experimental program. 



Hunt Creek Fisheries Research Area; began 1939, continuing; $9,109; 

 David S. Shelter, Leader; reports available. 



Address inquiries to: As in No. 3 above. 



39. Hillsdale Ponds Fishing Experiment 



A complete angling record is secured under a permit system enabling 

 study of the rate of removal by angling from a known fish population. 



Hillsdale Hatchery; began 1946, continuing; $2,657; K. G. Fukano, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



40. Creel Census, Pigeon River Area 



The project, aided by a permit system secures a complete record of fish- 

 ing on 4. 8 miles of the Pigeon River and from trout lakes on the area. 



Pigeon River Fisheries Research Area; began 1950, continuing; $5,693; 

 Thomas F. Waters, Leader; reports available. 



Address inquiries to: As in No. 3 above. 



41. Population Studies, Hunt Creek 



The objective is to determine residual populations through the use of various 

 estinnation techniques in waters of Hunt Creek drainage at the close of the angling 

 season. 



Hunt Creek Fisheries Research Area; began 1949, continuing; $2,277; 

 David S. Shetter, Leader; reports available. 



Address inquiries to: As in No. 3 above. 



42. Fish Population Studies 



Determination of the size of populations of legal- sized game fish is the basis 

 for interpretation of creel census data, and effects of special regulations. Esti- 

 mation techniques are evaluated by use of mark and recapture methods. 



Selected lakes; began 1952, continuing; $7,212; Gerald P. Cooper, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



43. Trout Population - Rifle River 



Through various techniques the population trends of trout in Upper Rifle 

 River are followed as a method by evaluating effects of watershed improvement. 



Rifle River; began 1950, continuing; $5,693; Howard Cowing, Leader; 

 reports available. 



Address inquiries to: As in No. 3 above. 



44. Sea Lamprey Survey 



The purpose is to deternnine the distribution of sea lamprey ammocoetes 

 for future control, to determine the degree of escapennent of sea lampreys and 



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