MICHIGAN (Cont. ) 



22. Trout Population - Rifle River. 



Through various techniques the population trends of trout in Upper Rifle River are 

 followed as a method of evaluating effects of watershed improvement. 



Upper Rifle River, Ogemaw County; began in 1950, indefinite; $4, 752; Howard Gowing, 



Proj. Ldr. 

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



Annex, Ann Arbor, Mich. 



23. Experinnental Planting of Fingerling Brown Trout. 



The project will determine survival of marked fingerling brown trout through creel 

 census and periodic population checks. 



Rifle River, Ogemaw County; began in 1952, planned for 6 years; $297; Howard 



Gowing, Proj. Ldr. 

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



Annex, Ann Arbor, Mich. 



24. Creel Census, Pigeon River. 



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

 sure, and fishing quality on 4. 8 miles of Pigeon River. 



Pigeon River Area; annually throughout trout season; $5,049; E. L. Bacon, Proj. 



Ldr. 

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



Annex, Ann Arbor, Mich. 



25. Limiting Factors in Trout Populations. 



By physical chemical, biological analyses of certain sections of a trout stream, 

 effort is being made to ascertain which limnological features limit density of 

 the trout population. 



Pigeon River, Otsego and Cheboygan Counties; began September 1950, completed 



September 1952; $2,784; N. G. Benson, Proj. Ldr. 

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



Annex, Ann Arbor, Mich. 



26. Hunt Creek Creel Census. 



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

 in angling pressure and success. Creel census results are also used to evalu- 

 ate the experimental program. 



Hunt Creek Trout Research Station; began in 1939, continuing; $9,504; D. S. Shetter, 



Proj. Ldr. 

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



Annex, Ann Arbor, Mich. 



44 



