WASHINGTON (Cont. ) 



4. Salmon Fresh Water Environmental Study. 



This is a study of stream environmental conditions that affect the survival and re- 

 sultant downstream migration of salmonoid fishes. The production of fish food 

 organisms in natural stream beds is being compared with adjacent areas that 

 have been disturbed by road construction, dredging, channeling, etc. It is hoped 

 that answers obtained in this study will give this agency a basis of assessing the 

 detrimental effects to fish life that occur when projects of this nature are pro- 

 posed or undertaken. 



Little Bear Creek, King County; began July 1952, planned for 1 year; $1,750; 



William A. Smoker, Project Leader; mimeographed progress reports available. 

 Address correspondence to: D. R. Johnson, State Fisheries Lab. , Fisheries 



Center, Univ. of Wash., Seattle 5, Wash. 



5. Minter Creek Migration Studies. 



Weirs have been installed to enumerate both upstream and downstream migrating 

 trout and salmon. The survival of various ages and sizes of hatchery planted 

 salmon is being studied. The natural seeding and the resulting survival of young 

 is being compared with hatchery plantings. An attempt is being made to determine 

 the approximate numbers of adult salmon that will produce an optimum yield of 

 migrants and returning adults. 



Minter Creek, south Puget Sound; began in 1937, indefinite; $18,000; Ernest Salo, 

 Project Leader; reports in Dept. of Fisheries Annual Bulletins. 



Address correspondence to: D. R. Johnson, State Fisheries Lab. , Fisheries 

 Center, Univ. of Wash. , Seattle 5, Wash. 



6. Pollution Studies. 



The objective of this study is to determine the effect of various pollutants on fish 

 and fish food organisms. Salmon and steelhead trout are the principal test ani- 

 mals that are being subjected to tests involving varied exposures to pollutants 

 of different concentrations. The effluents of pulp mills (sulphite and sulphate 

 liquors) are being given special consideration in this study. 



Deception Pass Marine Research Station; began June 1950, indefinite; Gilbert 

 Holland, Project Leader; reports will be available by September 1953. 



Address correspondence to: D. R. Johnson, State Fisheries Lab. , Fisheries 

 Center, Univ. of Wash. , Seattle 5, Wash. 



(Closely related to Project 1, page 114.) 



U. S. Forest Service 



Sedimentation studies - see Oregon. 



115 



