Figure 2. --Size frequency of the albacore caught on the North Pacific 

 ground, by months (northward- and southward-moving 

 albacore combined). The series of figures represents 

 the transition of the modes. The ordinate represents 

 the frequency in logarithnns. 



number has been attached in figure 2, and 

 make the various length groups correspond as 

 shown below, each vertical column can be 

 considered as representing a single age 

 group. 



1951 

 1952 

 1953 

 1954 



K 4^ 3*2 



^5N^3 



6"^5^4 



I II m IV 



The various groups are made to correspond 

 in this way, and then they are numbered in 

 order beginning with the smallest, Group 1, 

 Group II, etc. (Group V, which has a modal 

 length over 90 cm. , is not shown in figure 2. ) 

 According to figure 2, these length groups 

 correspond respectively to Group I, Group II, 

 . . . Group V of the southward-moving albacore 

 which are taken on longlines from autumn of 

 one year through into the next year. Table 1 

 shows the modal length of each length group, 

 and table 2 the proportion of each length group. 



Table 1. --Modal length of each length group 



17 



