Fishery bulletin of the Fish and Wildlife Service - NOAA

SAUMON RUNS OF THE COLUMBIA RIVER IN 1938 147
entirely offset by the 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 April 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 chinooks 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 doubtful
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 these runs are apparently those afforded by artificial propagation, stream improvement,
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. Copeia 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 OP FISHERIES.
1928. Fisheries Service Bulletin No. 152, Jan. 2, 1928.