Table 13 



Morphometric data on albacore taken east of Cape Nojima, Jan.> 

 fJay 1937 (Fuii Ma m sujpvry) 



Accordingly it appears that there is a difference between Zunan and Palao 

 skipjack in regard to the correlation between body length and growth of the 

 vertebraeo From the data from the P&laos it is surmised that the first ring 

 {ti) Is completed at a body length of 27 cm, the second (r2) at 37 cm, the third 

 (r3) at 46.5 cm, and the fourth (r^) at 55 cfflo For the Zunan specimens the cor- 

 responding figures are 26 cm^ 34 cm, 4,3 cm, and 54 cm. This means that if one 

 takes errors in measuring into consideration, the body lengths at which the va- 

 rious rings are formed can be considered equal for both groups of fish. The 

 development of the vertebrae in the Zunan schools is poor by comparison with 

 that of the Palao schools. 



Taking the average condition factor for Palao skipjack as 25 (Table 15), 

 the length and weight ranges and rate of growth for each age were determined. 

 (Table 16) c "'ith skipjack from Japanese waters the author classed those having a 

 condition factor under 20 as shoal fish and those with a condition factor of 

 over 20 as fish from migrator/ schools. The fish taken in Palao waters had an 

 average condition factor of 25=3 and so were considered to be micratory fish, 

 while those from Zunan wators, with an average of 20, were close to the shoal 

 schools. It is thought that the fish in these two categories set up by the author 

 also show a difference in the rate of growth of the vertebrae. The author wishes 

 to verify this point by a consideration of more data in the future. 



12 



