IDAHO (Cont. ) 



Nez Perce County; began August 1955, closed Decennber 1956; $7400; Leon 

 Murphy, Leader. 



Address inquiries to: Jannes C. Simpson, as in No. 1 above. 



University of Idaho 



1. A Study of the Influence of Logging on Trout Streams in Northern Idaho 



The purpose of this project is to measure the effects of logging and asso- 

 ciated activities on certain physical, chemical, and biological features of 

 streams within the drainage areas. Two pairs of streams have been under 

 investigation for two years. One of each pair will be logged in the next few 

 years, the other will be left uncut for another five or six years, to serve as a 

 control. Measurements on all streams will continue on a maintenance basis 

 and will include temperature, flow, turbidity, sedimentation, oxygen, alka- 

 linity, pH, conductivity, production of bottom organisms , age, growth, abxin- 

 dance, and food habits of the fish populations. 



Potpatch Forests, Inc. and U. S. Forest Service cooperating; St. Joe and 

 North Fork Rivers; began June 1955, to close 1965; $2, 000; Virgil S. Pratt, 

 Leader. 



Address inquiries to: Virgil S. Pratt, Idaho Cooperative Wildlife Research 

 Unit, University of Idaho, Moscow, Idaho. 



2. A Fishery Survey of Priest Lake, Idaho 



The objectives are to measure the production and sport catch of cutthroat, 

 Dolly Varden, and lake trouts, and kokanee in Priest Lake and to determine 

 the cause or causes of the decline of the cutthroat population. The project 

 embraces general studies of certain limnological features of the lake and de- 

 tailed studies of the fish populations. Included are investigations of game fish 

 production and catch, food habits, spawning activities, age and growth, and 

 contribution of the tributaries to the game fish population of the lake. 



Idaho Fish and Game Department cooperating; Bonner County; began June 

 1955, to close Febrxiary 1957; $5,000; Ted C. Bjornn, Leader. 



Address inquiries to: Virgil S. Pratt, as in No. 1 above. 



U. S. Fish and Wildlife Service, Branch of Fishery Biology 



1. Effect of Light Waves on the Migration of Salmon Finger lings 



This project has three objectives: (1) To study the effect of light on guiding 

 downstream migrants, (2) To determine the most effective type of light source 

 for guiding fish, through experiments with different light arrays, and (3) To 

 determine whether practical installations can be made at water-use projects. 



Redfish Lake, Salmon River, Idaho; began 1954, to close 1957; $8802; 

 D. R. Craddock, Leader. 



Address inquiries to: Clinton E. Atkinson, Chief, Pacific Salmon Investi- 

 gations, 2725 Montlake Blvd., Seattle 2, Washington. 



U. S. Fish and Wildlife Service, Office of River Basin Studies 



1. Investigations on Biological Limitations 



The purpose of this project is to determine the factors controlling the pro- 

 duction of fish in a stream. The factors studied are the physical character- 

 istics of the stream and the water, the quantity of and quality of spawning areas, 

 and the kind and amount of food available to the fish. 



Salmon River; began September 1955, indefinite; $12, 000; Arthur S. Hale, 

 Leader. 



Address inquiries to: Regional Director, U. S. Fish and Wildlife Service, 

 P.O. Box 3737, Portlands, Oregon. 



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