Aug. -Sept. K= 25o3s//- 3«A »o. (2A) Nov. /<=22.8s//- 2o5 ... (2/i') 



The oblateness c of the saury is greater than that of the skipjack, being 

 0-33— 0-53^ so S can be generally shown by formula (7), but formula (8) 

 will show it closer to the truth. If we look at the correlation of c with 

 K and 1/ , as shown in Figure 13, in the August and September fish there is 

 a tendency for K to be larger as C is smaller, y/ , too, tends to increase, 

 although the points are scattered, indicating that the fatter the fish are 

 the rounder they are, however, the situation with regard to the November 

 fish is not clear. 



To summarize, in both the skipjack and the saury the condition factor 

 K is mainly proportional to the product of <1= body height/body length and 

 /3~ body width/body length. It is thought that as d. and S increase with 

 the body length, the increase in the body height and the body width are 

 proportionally greater than the increase in the body lengxh and therefore 

 the body of the fish becomes rounder and shows a tendency for the area of 

 the cross- section, and consequently the volume of the body, the body 

 weight, and K to increaseo For that reason it was found that it is a 

 practically effective method to measure S as a standard for K qt'XP <, 

 Finally, I wish to express my gratitude to MessrSo Gorozo Okamoto, Nobuo 

 Watanabe, and Takeo Maruyama, who helped me with measurements or supplied 

 data, and to the crews of the Soyo Maru, the Kaijin I'aru, and the Senkatsu 

 Maru. 



/ TN: The thirteen figures illustrating this paper are scatter diagrams 

 which cannot be traced from the microfilm projection with any degree of 

 accuracy. They have therefore been omitted from this translation, only 

 their descriptions being given beloWc 



Figure 1 A scatter diagram of skipjack body temperature against water 



temperature for the Zunan and Ogasawara areas in May 1936 and May 19-^0, 

 Figure 2 A scatter diagram of body temperature (horizontal axis) against 



the difference between body temperature and water temperat-ore (vertical 



axis). 

 Figure 3 A histogram of the frequency (vertical axis) of differences 



between body temperature and water temperature (horizontal axis). 

 Figure k A scatter diagram of the difference between body temperature and 



water temperature (vertical axis) and the y/ater temperature 



(horizontal axis). 

 Figure 5a A scatter diagram of body temperature (vertical axis) against 



water temperature (horizontal axis) for 31 yellowfin tuna. 

 Figure 5b A scatter diagram of body temperature (vertical axis) against 



water temperature (horizontal axis) for 18 black marlin. 

 Figure 5c A scatter diagram of body temperature (vertical axis) against 



water temperature (horizontal axis) for 22 white-tipped shark. 

 Figure 5d A scatter diagram of body temperature (vertical axis) against 



■\flrater temperature (horizontal axis) for 103 dolphin. 

 Figure 6 A scatter diagram of log body weight against log body length for 



skipjack taken by the Kaijin Maru and Senkatsu Maru in May 1936 and 



the Soyo Maru in May 194-0 o 

 Figure 7 A scatter diagram of k condition factor (vertical axis) against 



length in cm (horizontal axis) . 



23 



