Table 4. --Data 

 Maru of Mie 



from observations west of Midway I. ( No. 1 Taiyo 

 Prefecture) 1951 



The marked differences in water temperatures, even between 

 adjacent areas, indicate the complexity of the oceanographic conditions. 

 The thermocline between the depths of 150 and 200 m. , which was not 

 apparent in the observations 200 miles directly east of Cape Inubo or 

 those 300 miles directly east of Cape Nojima, are clearly revealed in 

 this sea area. The lower limit of 18°C. is at the depth of 100 to 150 m. , 

 and thus the eastern North Pacific Current has a greatly reduced depth 

 as compared with the nnain Kuroshio, however, it still shows considerable 

 strength. As for the chlorinity, it indicates rather high values as com- 

 pared with the main Kuroshio at roughly the same time. However, below 

 the thermocline the chlorinities are rather low. 



Table 5. --Sizes of albacore taken in the 

 North Pacific in January (weights in 

 kan = 8. 27 lbs. ) 



Table 5 shows the average 

 weight of the albacore taken in 

 this sea area in January. The 

 general tendency, just as in the 

 preceding month, is for the fish 

 to be larger on the southern side 

 of the fishing grounds and for the 

 size to decrease to the northward. 

 The size of the fish also increases 

 from west to east. However, on 

 the east and west sides of the line 

 of l60 E. longitude the trends in the change of fish size are somewhat dif- 

 ferent. That is, east of 160 E, the change in the size of the fish from north 

 to south is not as clear as it is west of that longitude. The albacore taken 



65 



