It is suggested that heavy angling pressure, in combination with egg- 

 taking activities on Pelican Creek, has been a factor in the decrease in 

 length of fish in the northern end of Yellowstone LaKe. 



ac?;no/Jledgemfm: 



Many persons have contributed to the compilatior. cf data upor which 

 this study is based. Pish culturists assi^-^ied to the Branch of Game-fish 

 and Hatcheries have played a large part in the program ty measuring fish. 

 Mr. William A. Dunn, Superintendent^ U.S. l-lshery Statiov... Yellowstone 

 Park, cooperated in this effort by arranging for trout maa^^urements by 

 hatchery personnel as part of the program sponsored by the Branch of 

 Fishery Biology. The names of all crintribu"oing fish culturists and fish- 

 ery biologists are too numerous to mention here, but certain imiividuals 

 should be given credit for notable effort in zhe measurement program. 

 These persons are Philip Cuccia, Stacy Gebhards^ Thomas Kruse, Kenneth 

 Liscom, Harvey Moore, Albert Regenthal, James Welsh^, Bernt Westre, and 

 Dr. Stillman V/right. Assistance in statistical treaT.me'\t was rendc^red by 

 Albert Regenthal, 



The National Park Service, through Superintendent Ecin.und B. Rogers, 

 has been most cooperative in this study. 



