In the following I will present the results of actual measurements of the 

 various elements of the iDodies of skipjack and saury. 



(1) Bodily essentials of the skipjack s The measurement data are those 

 taken by the author from 193 individuals aboard the Kaijin Maru in the 

 Zunan-Ogasawara area on May 6-9, 1936, those taken by Mr. Gorozo Okamoto 

 from 67 individuals aboard the Sensho Maru in the same area from May 28 

 to June 9 of the same year, and 3 individuals taken by trolling from the 

 Soyo Maru from May 3-26, 194-0 and measured by the author with the aid of 

 Mr„ Takeo Maruyama, or a total of 268 individuals. If the data for all 

 of these fish are assembled, the relationship (4-) of W (gr) and / (cm) is 

 as shown in Figure 6. 



^ is 17 - 30, and the relation between ^ and ( is as shown in Figure 7. 

 with a tendency for it to grow larger as I increases,, From formula (9) 

 it may be expected that /C'oo/'^'^^j, however, if we try to find the correlation 

 with I from the graph, it can be shown roughly by the following formula, 



A'= 0.4,/ -f 4 oooo... o. ....... o„<,„,o..o.(lO) 



The correlations between body height {^z), body width {di)^ and 

 total length (4^) and / are as shown in Figure 8, and give approximately 

 the following linear equations. 



/i =^ Oo37/-6....(ll), c/, =0„33^6,7..o.(12), Z - 1,08/ „,..(13) 



From Figure 9 the correlation between K and d fj is approximately 



A'==-. 387 a:/? + 3o2 ..., <,o ....... o .(14) 



The attempt was made to find p by submerging the fish in a vessel full of 

 water and dividing the volume V shown by a measuring stick by IaI j but be- 

 cause there was much error in 1/ , a value of 0.9 - lol was obtainedo 

 When at equilibrium in the water, the density of the sea water being thought 

 to be close to 1,02 - 1.03, it was assumed tentatively that P =1 giving 

 /^*=^387 from formula (S), The ellipticity of skipjack was c = 0,2 - 0,3, 

 Using this and getting S by formula (8) gave results no different from 

 those of formula (7), from which it was seen that it was satisfactory to 

 consider it the circumference of a circle with a diameter of '^ ^" , 



(2) Bodily essentials of saury . From August 16 to September 6, 1940, 

 aboard the Soyo Maru while on a cruise in the coastal waters of Hokkaido 

 and the Kuriles the author collected at night 28 saury and, with the help 

 of Mr, Nobuo Watanabe, measured them. On November 26 of the same year the 



(4)ln measuring ZV aboard ship a balance is more accurate than a spring scale. 

 Some device is necessary to eliminate the effects of the swell and the 

 engine vibration on the indicator needle. When I was measured with a 

 roll-up tape there was an error of 0,2 cm. There is a good deal of 

 error in measuring d so calipers should be used. 



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