MONTANA (Cont. ) 

 Address inquiries to: Jack E. Bailey, as in No. 8 above. 



10. Marias River Rehabilitation Restoration 



Rehabilitation of the Marias River drainage above Tiber Dam was accom- 

 plished during 1954 and 1955. The major objectives of this rehabilitation work was 

 was the removal of carp and goldeneye, the decimation of other undesirable species, 

 and their replacement by trout in approximately 1, 000 miles of streams above 

 Tiber Dam. 



Checking for isolated or localized breeding populations of carp was con- 

 tinued through 1956. 



Planting of rainbow trout in Tiber Dam and the Marias drainage is the 

 largest part of this project, the planning for which is yet to be completed dur- 

 ing 1957-58. 



Marias River drainage; began May 1954, to close April 1957; $14,800; Nels 

 A. Thoreson, Lieader; reports available. 



Address inquiries to: Nels A. Thoreson, P. O. Box 252, Belt, Montana. 



11. Biology of the Squawfish and Columbia River Chub in the Blackfoot Drainage 



The objectives of this project are to determine the distribution, spawning 

 periods and areas of the sqviawfish, Ptyclocheilus oregonensis, and the 

 Columbia River chub, Mylocheilus caruinus, in the Blackfoot drainage. The 

 life histories of these two non-game species are being investigated to better 

 ascertain the necessity and best methods of directing control measures on 

 them, especially prior to the advent of new impoundments near the headwaters 

 of Montana's west slope streams. 



Montana State College cooperating; Missoula, Powell, and Lewis and 

 Clark Counties; began May 1956, to close April 1958; $4,500; Arthur N. Whitney, 

 Leader. 



Address inquiries to: C. W. Hill, Jr. , Z and E Department, Montana State 

 College, Bozeman, Montana. 



12. Comparison of Fish Populations of Six Clearwater Lakes 



The purpose of this project is to obtain indices of relative abundance of the 

 various species of fish an six of the Clearwater River chain of lakes in order 

 to better evaluate different management measures used on individual lakes in 

 the chain. To reduce the effects of seasonal and weather variations in net 

 catches, the lakes are netted simultaneously during one week in June by one 

 two-man crew on each lake. Net sets are recorded on maps and nets are re- 

 set in approximately the same locations each year. Indices of abundance are 

 computed as fiducial intervals at the 80 percent probability level of the catch 

 per net-night by species. Standard lake survey information and age and growth 

 data are also taken. This job is in its second year. 



Missoula County; began May 1955, to close April 1957; $3,500; Arthur N. 

 Whitney, Leader; reports available. 



Address inquiries to: Arthur N. Whitney, Montana State Fish auid Game 

 Department, District No. II, P. O. Box 1138, Missoula, Montana. 



* 



13. Northeastern Montana Fishery Study 



In Fort Peck Reservoir and to some extent in the immediate drainage, 

 the goldeye is very abundant. To augment and to bring together the somewhat 

 scattered and fragmentary information on the goldeye a study is being made. 

 To date, scale samples have been taken, stomachs and gonad samples have 

 been preserved, and observations have been recorded. Scale samples are 

 also being taken from sauger and yellow perch. 



Four cool water ponds have this year been made available for public 



83 



