Of the 31 fish in tha latter gri^up the number in each age class is an fol- 

 lows: 



seventh year. 1 f ieh 



sixth or oeTenth yeer <>.........<,....<> 1 fish 



sixth year. . , „ , ....<. 8 fish 



fifth or sixth year c . . ^ . . . , 6 fish 



fifth year, ,7 fish 



fourth or fifth -rear. . . „ „ c, . . ,. . 2 fish 



fourth year. « 1 fish 



second or third year , 3 fish 



third year. , . . 1 fish 



second year «. 1 fish 



In this group the seventh-year fish are outnumbered by the sixth-year and 

 fifth-year fish, and there is an admixture of young fish of the fifth, fourth, 

 third, and second y«ar-clai3ses which Tiakes this sample differ greatly in age com- 

 position from any yellowfin tune Trtiich I have examined hitherto. Of particular 

 interest is the seccnd-ybar fish 51 cn» in length and 730 moTg.Tie in weight which 

 was the smallest yellowfin taken in the oourae of the survey. The presence of 

 such a young fish makes one think that the spawning grounds of the yellowfin 

 tuna cannot be far from this area, 



* « * 



Dr, Aikawa'a table of the ago of fishes correlated with length and vraight ranges 



1. Albacore 



Weight 



Age 



Fish of the year (0 age group) 

 Second-year fish (I age group) 

 Third-year fish (II age 

 Fourth-year fish (III age 

 Fifth-year fish (IV age group) j 53 - 67 

 Sixth-year fish (V age group) 

 Seventh-year fish (VI age group) 

 Eighth-year fish (VII age group) 

 Ninth-year fish (VIII age group) 



Length 



0o/V9 kg I 0.13 kan 

 ia3 - 1=39 0,3 - 0.37 

 1.39 - 3,19 0.37 '0.8? 

 3.19 - 5.63 

 5«63 - 8,62 

 8o62 -12.38 

 12.38 -18,00 

 18.00 -Z^.OO 

 2/^.00 



29 



