In the Numazu landings for 1937 also weight groups can be seen which corres- 

 pond to each year class. (Table 9), 



The small yellowfin stay in the waters near Numazu for a longer period of 

 time than do the small black tuna and fish up to the third-year class are taken 

 the year round. Probably fourth-year suid older fish go out into pelagic waters 

 and take up a migratory life. Just as in the case of the black tuna, large fish 

 of the fourth year and older are most numeirous in the spring and do not appear in 

 the aitumn. 



III. Albacore Germo germo (Lacepede) 



Ten large albacore taken by the Fuji Maru of the Shizuoka Prefectural 

 Fisheries Experiment Station netu* Midway I. in January 1938, and five small fish 

 taken on trolling lines by the same Station's Soyff Maru off northeastern Japan 

 wi^re obtained and age determinations by means of the vertebrae were made. 

 (Table 10) . Of the 38 vertebrae flft\ich albacore in most cases posses, the five 

 from No. 9 to No, 14 were taken and the total radius of the centrum (T mm) and 

 the radius of each ring (r mm) were measured, (Table 11). 



The cQirrelation between body length (L cm) and total radius (T mm) is shown 

 by I^/l\ (Ti - 7.9)/(T2 - 7.9). (Figure 6). 



From the radius (rjj mm) of annual ring No. n, the length (L^ cm) at irtiich 

 the ring was completed can be found by means of the formula L^ z 5''8 r„+17"5, 

 (Table 12). For the albacore taken by the Fuji Maru in the waters east of Cape 

 Nojiraa (28° - 34° N,1700- 173° E) in the spring of 1937 the average condition 



