WYOMING (Cont. ) 



8. Techniques and Equipment Used in Fisheries Work 



The object of the project is to improve methods for gathering and treating 

 data. Phases under study are the use of trawls to collect fish from Wyoming 

 waters and the development of a statewide gill net index to aid in the evalua- 

 tion of gill netting data. Statistical methods are employed. 



University of Wyoming cooperating; statewide; began July 1955, to close 

 December 1957; Fred W. Jackson and Thomas H. Leik, Leaders; reports 

 available. 



Address inquiries to: Fred W. Jackson (trawl experiment) or Thomas 

 H. Leik (gill net index), Wyoming Game and Fish Commission, Cheyenne, 

 Wyoming. 



10. Studies on Life Histories of Burbot and Cutthroat Trout 



Life history studies have been undertaken on burbot and cutthroat trout to 

 gain knowledge needed for the preservation of these species. In each case, 

 particular emphasis is being placed on spawning habits. 



Wind River Drainage and Snake River drainage; began January 1955, con- 

 tinuing; Fred M. Eisernnan and Delbert H. Rasmussen, Leaders. 



Address inquiries to: Fred M. Eiserman or Delbert H. Rasmussen, 

 Wyoming Game and Fish Commission, Cheyenne, Wyoming. 



11. Lake, Stream, and Farm Pond Surveys 



Surveys of particular importance include initiation of a systematic survey 

 of waters in Snowy Range Division of Medicine Bow National Forest and the 

 Clear Creek Drainage in northern Wyoming. 



Statewide; began January 1951, continuing; Fred T. Willianns, John W. 

 Mueller, and Charles L. Sowards, Leaders. 



Address inquiries to: Fred T. Williams, John W. Mueller or Charoes 

 L Sowards, Wyoming Game and Fish Commission, Cheyenne, Wyoming. 



12. Manipulation of Fish Populations in Streams 



The object of this project is to determine when it is practical to reduce or 

 eradicate fish populations in streams to benefit desired species. Fish toxi- 

 cants, shockers and seines are employed. Evaluation is based on follow-up 

 studies. Seven streams are involved ranging from the North Platte River, 

 one of the largest in Wyoming which was chemically treated to eliminate suckers 

 from 26 miles, to small creeks. Brown trout and mountain whitefish have been 

 experimentally removed in addition to non-game species. 



Statewide; began June 1954, continuing; George D. Holton, Leader. 



Address inquiries to: Supervisor, Fisheries Field and Research Opera- 

 tions, Wyoming Game and Fish Commission, Cheyenne, Wyoming. 



13. Lake and Pond Rehabilitation 



As a management procedure, lakes and ponds with off-balance fish popu- 

 lations are chemically treated to eliminate the existing fish and are restocked 

 with desirable species. 



Statewide; began July 1950, continuing; George D. Holton, Leader. 



Address inquiries to: As in No. 12 above. 



14. Statewide Creel Census 



The object of this study is to determine the most practical method for 

 Wyoming to use in determining statewide trends in fishing pressure, success 

 and harvest and distribution of fishing pressure. During 1956, fisherman 

 counts on all important waters in southeastern Wyoming were made periodically 

 by air and ground observers. Also, a study was inaugurated to evaluate the 

 possibilities of a mail fishing survey. 



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