Table 15. --Water temperatures in the Kinan Sea Area, December 

 1952 



3. Okinotorishima Fishing Ground 



The position of this fishing ground has not changed much from 

 November, but it shows a tendency to expzuid to the southwest and its 

 southern extremity reaches 17 N. With this expansion of the fishing 

 ground, its center also moves gradually to the south or southwest. In 

 general the catch rates are about 1. to 2. 5, not greatly different from 

 November. 



There appear to be extreme fluctuations in fishing conditions on 

 this fishing ground from year to year, and table 16 shows these changes 

 in the catch rates for the period 1949 to 1951. 



Table 16. --Annual fluctuations in the catch rate on the Okinotorishima 

 fishing ground 



52 



