succeeding upstream pools declined 

 rather markedly as the experiment 

 progressed in time. 



Fallbacks were observed to occur 

 in greatest numbers at the dovm- 

 stream weir of the fishway and 

 become progressively less numerous 

 as the fishway was ascended. 



ACKNOWLEDGMENTS 



LITERATURE CITED 



CLEAVER, F. C. 



1951 Fisheries statistics of Oregon. 

 Oregon Fish Comm. , Contrib. fflb, 

 176 pp. , illus. 



HOLMES, HARLAN B. 



1940 The passage of fish at Bonneville 

 Dam. Oregon Fish Comm. , Contrib. 

 #2 — Dams and problem of migratory 

 fishes, pp. 182-192, illus. 



The authors wish to express their 

 thanks to the following staff members for 

 their conscientious and industrious efforts 

 during the conducl of these experiments: 

 J. R. Gauley, C. R. Weaver, R. S. Rupp, 

 E. F. Roby, R. J. Holcomb, J. S. Johnson, 

 and R. Foust. Members of the Biometrics 

 Unit of Pacific Salmon Investigations gave 

 valuable assistance in the review of certain 

 relationships appearing in the cuialysis of 

 the experiments. We are also indebted to 

 Ivan Donaldson, Harry Theus, and Al Chanda 

 (U. S. Army Corps of Enginee/rs) for their 

 suggestions and aid in varicus aspects of 

 the experiments. Those contributing to the 

 review of the manuscript included Milo C. 

 Bell, Joseph A. Craig, Dr. Gerald B. Col- 

 lins, and Clifford J. Burner. Dr. G. B. 

 Collins was instrumental in much of the 

 original design of the experiment. 



SCHONING, R. W. , T. R. MERRELL, JR., 

 AND D. R. JOHNSON 

 1951 The Indian dip net fishery at 

 Celilo Falls on the Columbia 

 River. Oregon Fish Comm., Con- 

 trib. #17, 43 pp. , illus. 



SILLIMAN, RALPH P. , WILLIS H. RICH, 

 AND FLOYD G. BRYANT 

 1947 Intraseasonal and interseasonal 

 variations in average weight of 

 Columbia River chinook salmon 

 ( Oncorhynchus tschawytscha ) , 

 1939-1945. U. S. Fish and Wild- 

 life Service, Specitil Scientific 

 Report — Fisheries No. 34, 11 pp., 

 illus. 



TAUTI, KCRISABURG, AND KIYOTERU MIYOSI 

 1934 Rate of ascent of f ishways by 



fishes. Proc. Pac. Sci. Congress 

 (Canada), vol. 5, pp. 3623-3631, 

 illus. 



18 



