57.6 



56 



55 



54 



53 



52 



51 ■ 



10 I 1-20 21-31 

 MAY 



l-IO 



11-20 21-30 1-10 11-20 21-31 

 JUNE JULY 



10 11-20 21-30 

 AUGUST 



Fi 



gure 3. --Average fork lengths, by ten-day periods of red, chum and 



pink salmon sampled aboard ten Japanese motherships in 1955. 



6 



