The travel times between Rock Island and Zosel 

 Dams are summarized in table 5. In view of the 

 discrepant results of 1962 and the confinement of the 

 1953 tagging to the end of the run, the effect of 

 Eocky Reach Dam on the travel time between Rock 

 Island and Zosel Dams is best obtained from the 

 records for 1954 and 1903. The travel times 

 tended to be slightly longer in 1903 than in 1954, 

 but the significance of this small difference is 

 questionable. 



In any event, the difference between travel times 

 in 1963 and 1954 is greatly overshadowed by the 

 difference between 1962 and 1963, after Rocky 

 Reach Dam was completed. The travel time in 

 1962 was much the longer and varied erratically 

 within the season — decreasing as the season pro- 

 gressed. This variability was not evident at Rocky 

 Reach Dam, where the appearance of the various 



T.\BLE 5.— Travel time of tanged sockeye salmon from Rock 

 Island Dam to Zosel Dam, 1953, 1954, 1062, and 1983 



For 195.3 and 1954. the dates are those when tasged fish which had 

 been released below Rock Island Dam reappeared in peak numbers at the 

 countmg stations of Rock Island Dam 



tagged lots was orderly in lioth years (fig. 6). It is 

 appropriate, however, to examine in greater detail 



T.\BLE i.—yumher of tagged sockeye salmon ohxcrved at Rocky Reach and Zosel Da 



1062 and 1963 



ms after release in the Rock Island Dam forehay, 



T..BI.E i.—\umher of tagged sockeye sahnon ahserred at Rocky Reach and Zosel Dams after release in the Rock Island Dam forehay 



1962 and 1963— Continued 



MIGRATION OF SOCKEYE SALMON 



139 



