Trap Cotch 



N= 38,573 

 EstimatedTotal Migration 

 N= 193,832 



Trap Calch 



N= 100,878 

 Estimated Total Migrotion 

 N= 318,504 



Trap Colcti 



N= 73,099 

 Estimated Total Migration 

 N= 245,980 



5 15 25 



APRIL 



5 15 25 



MAY 



4 14 24 



JUNE 



4 14 24 



JUNE 



Figure 10. — Seaward migration of Yakima River spring chinook salmon at Prosser, 1959-63. Number captured in the 

 trap are shown by broken lines. Solid lines indicate the calculated totals for the entire river (trap and remainder of 

 the river) . 



358 



U.S. FISH AND WILDLIFE SERVICE 



