216 



BULLETIN OP THE BUREAU OF FISHERIES 



In this report are presented the data collected up to and including the season of 1 927 

 as the result of marking young cliinook salmon. Additional returns are to be expected 

 during the next two or three years from some of the experiments described herein, and 

 a number of experiments have been started from which no returns are yet due. 



4^ 



16 



44 



122° 



Fig, 1.— a portion of the Polunihia River and its tributaries, showing the location of hatchei-ies and the localities in which 



marked salmon were recovered 



The experiments have been planned with the advice and cooperation of Dr. C H. 

 Gilbert, Commissioner of Fisheries Hemy O'Malley, and R. E. Clanton, formerly 

 director of hatcheries for the State of Oregon, and the success of the work has de- 

 pended largely upon the aid received from these officials. The actual marldng of the 

 young fish was under the direct supervision of the writers, who were assisted ably by 

 numerous hatchery operatives. 



