Table 3. --Local differences in the size 

 composition of North Pacific albacore 

 (October 1950) 



Notes: (1) The upper figure is the 



number of fish measured, 

 the lower the percentage, 



(2) The area of 38°N. -40°N. 

 has been omitted, 



(3) The column headed (M) is 

 average weight in kan. 



2, If a comparison is made between north aind south in sea areas 

 of the saxne longitude, the fish are larger to the south and tend to be smaller 

 to the north. 



These two phenomena are not limited to October, but appear in 

 November aind thereafter. In the charts from November on, a gradual 

 southward movement of the fishing grounds in these waters can be clearly 

 seen. Kishinouye^/ stated that in the case of the black tuna the fish taken 

 at the beginning of the fishing season were mostly large ones ajid that, 

 with the passage of time, the fish making up the catch gradually became 

 smaller. The facts stated under 2, above, show that this same phenomenon 

 can be seen in the case of the albacore. "What it means is that large fish 

 are more numerous at the leading edge of the migration. 



The fishing grounds in this region extend a long way from east to 

 west, but from north to south their width is not great, being about 200 to 

 250 miles, and although they move southward with the passage of time, 

 there is no great variation in their breadth. It goes without saying that 

 there is an indivisible relationship between the development of the fishing 



6/ 



— Kishinouye, Kamadcichi. 



University, Tokyo, 1923. 



Jour. College Agr. , Imperial 



18 



