230 



BULLETIN OP THE BUKEAU OF FISHERIES 



White Salmon River. Apparently there has been a tendency for the fish hatched 

 from eggs taken from early-running fish to enter the fresh water early, even though 

 planted in a stream typically inhabited by a late-running race. A more complete 

 discussion of this question is given in connection with later experiments, which offer 

 more conclusive evidence. 



EXPERIMENT NO. G.—HERMAN CREEK HATCHERY, MARCH, 1920 



Eggs from: Willamette and McKenzie Rivers, 1918. 



Reared and marked at: Herman Creek hatchery. 



Mark used: Removal of both ventral fins and the adipose fin. 



Number marked: 20,000. 



Liberated: In Herman Creek during March, 1920. 



Age: Appro.ximatel}' 18 months. 



The eggs from which these fish developed were hatched at Bonneville and the 

 fry were transferred to Herman Creek soon after hatching. Duiing Jime, 1919, 

 the greater number of the fish in the ponds were liberated, but those marked in this 

 experiment lingered in the pond and became mixed with sockeyes of the same age, 

 which had been placed in the ponds a few days after the chiaooks were liberated. 

 It was in the course of the marking of the sockeyes that the chinooks were segregated 

 and marked. 



Twenty-nine specimens preserved during the course of the marking average 



107.5 millimeters (4.2 inches) in length. Their scales have an avei'age of 13.8 rings 



42 2 

 and an average anterior radius of j^. millimeters. (See Table 8.) Scales from 



26 of the 29 individuals have an incidental check inclosing an average of 8.4 rings 



30 1 



(radius y^ millimeters). The winter check usually is absent but is represented on 



a few scales by one or two broken rings at the margin of the scale. Two specimens 

 have a faii'ly distinct winter check followed by a couple of rings of the rapid growth 

 of the second year. (See fig. 35.) Figure 34 illustrates a scale in which both the 

 incidental check and the winter check are lacking. 



Table 8. — Chinook-salmon yearlings marked at Herman Creek hatchery during March, 1920 



