SALMON RUNS OF THE COLUMBIA RIVER IN 1938 



129 



Table 17. — Daily catch of chinook salmon in Zones 1 and 2, June 5 to July SO, 19SS, and Bonneville 

 count for corresponding runs, June 19 to August 13, with derived figures showing fluctuations in catch 

 during the week — Continued 



Table 18. — Variation in certain features of the chinook salmon catch in Zones 1 and 2 

 and of the Bonneville count during June and July, related to the days of the week 



Day of the week 



Sunday 



Monday 



Tuesday 



Wednesday. 

 Thursday... 



Friday 



Saturday 



Thousands 



mean total 



catch 



47.4 

 43.2 

 40.5 

 35.0 

 34.9 

 35.2 



Mean 

 percentage 

 of weekly 



total 



19.8 

 18.1 

 16.8 

 14.9 

 14.4 

 15.2 



Mean 



delivery per 



gill net 



88.9 

 83.0 



7S I 

 72.9 

 72. B 



69.8 



Mean 

 percentage 

 of weekly 



total of 

 Bonneville 



count 



13.6 

 14.5 

 14.2 

 14.3 

 17.4 

 14.2 

 11.8 



The intensity with which the June-July run is being exploited is shown in still 

 another way by comparing the change in the weekly totals of the catch with the weekly 

 totals of the Bonneville count for the corresponding weeks. These data are given in 

 table 12, where the two series may be readily compared. It is seen that the catch 

 below Bonneville during June and July constantly increased from 2,630 fish in the 

 week of June 4, to 16,363 fish in the week ending July 30. At the same time the 

 number of fish passing the Bonneville Dam remained, except for the last week, below 

 the count for the first week of the period. It is obvious that the effect of an increased 

 run entering the river is not felt at Bonneville — a result, without doubt, of a concurrent 

 increase in the intensity of fishing. It is to be noted that the record of the catch above 

 Bonneville Dam agrees with that of the Bonneville count, and thus supports this 

 interpretation. As a measure of this intensity we may take the total number of 



