SALMON RUNS OF THE COLUMBIA RIVER IN 1938 



113 



1 Includes 20 counted previous to the week ending April 9. 



Tables S, 9, and 10 give the counts made at Rock Island Dam during the years 



1933 to 1938, inclusive. These were all actual counts which are presumably accurate, 



both as to number and identification. In addition to the records given in these tables, 



78 silver salmon were counted at Rock Island Dam late in September and early in 



October 1938. 



MODIFIED TABLES 



The data on the run of 1938 (tables 1 to 10) are presented below in such form as 

 to bring out certain facts bearing upon the biological and economic importance of 



