SALMON RUNS OF THE COLUMBIA RIVER IN 1938 147 



entirely offset by tbe very intensive fall fishery that is concentrated in Zone 6, above 

 Bonneville Dam. 



9. The closed period of March and April protects from the commercial fishery 

 the run of cbinooks that enters the Willamette River during Aprd and early May, 

 but this run is subjected to an intensive sport fishery below the falls at Oregon City. 

 Unfortunately there are no data on the sport catch or on the Willamette run as a 

 whole. This closed period also protects a small run of cbinooks to the main river, the 

 principal portion of which passes through the commercial fishing area before the 

 season opens on May 1. 



10. The main runs of all species of salmon to the Columbia River are practically 

 unprotected from exploitation. If all existing restrictions were removed, it is doubt- 

 ful whether the catch would be materially increased, or, conversely, that the remaining 

 brood stock would be materially decreased. The only present aids to the conservation 

 of those runs are apparently those afforded by artificial propagation, stream improve- 

 ment, and, possibly, the restrictions that apply to the use of traps and wheels. 



LITERATURE CITED 



Craig, Joseph A., and Hacker, Robert L. 



1940. The history and development of the fisheries of the Columbia River. U. S. Bur. Fish. 

 Bull. 49(32): 133-216. Washington. 

 Pritchard, Andrew L. 



1934. Pacific salmon migration: The tagging of the spring salmon in British Columbia in 

 1929 and 1930. Biological Board of Canada, Bull. 41, 31 pp. Ottawa. 

 Rich, Willis Horton. 



1940a. Seasonal variations in weight of Columbia River chinook salmon. Copcia 1: 34-43. 

 New York. 



1940b. The future of the Columbia River salmon fisheries. Stanford Ichthyological Bulletin 

 vol. 2, No. 2. Palo Alto. 



1941. The present state of the Columbia River salmon resources. Sixth Pacific Science 

 Congress, Proceedings, vol. 3. Berkeley. 

 U. S. Bureau of Fisheries. 



1928. Fisheries Service Bulletin No. 152, Jan. 2, 1928. 



