catch rate appears in January, making it appear that there is a lag of about 1 month as connpared 

 with the area fronn 30 to 35 N. , but the difference is not very conspicuous. Albacore are 

 most abundjtnt in January, reaching their peak one nnonth earlier than the February mjiximum 

 appearing in the airea of 30 to 35 N. No very marked difference can be detected in the case of 

 the spearfishes. Thus there are notable differences in the case of black tuna and the yellowfin, 

 but no conspicuous differences can be detected for the other species. 



Table 88. --Fishing situation by months (30° to 35 N. , 

 150° to 160° E.) 



As we compare this with the sea area east of the Izu Islands, which is adjacent on the 



west, 



1. There appears to be Sonne difference in the black tuna fishing situation as catches 

 are made in the area east of the Izu Islands from January to April, and in this sea area only fronn 

 December to February. 



2. In the sea area east of the Izu Islands yellowfin are most abundant in August and 

 some are taken throughout the year. In this sea area they are taken from October through 

 December. As we have no data for August, it is not possible to make a comparison with the 

 area east of the Izu Islands. 



3. There does not seem to be any marked difference between the two sea areas with 

 regard to the bigeye tuna, but in general this sea area appears to have higher catch rates. It 

 should be noted that in the sea area east of the Izu Islands the peak catch rate is reached in April, 

 but no comparison is possible because we lack data for April for this sea area. 



4. The peak albacore season appears to be about I month later in this sea area. 



5. The following table provides a comparison of fishing conditions for spearfishes and 

 sharks in the three sea areas discussed above. 



o o 



There are remarkably few data for the area from 25 to 30 N. 



150° to 160° E. 



and they are unevenly distributed seasonally so it is difficult to make a comparison. In the case of 

 the striped marlin, the maximum catch rates of the year appear around June and July at 30 to 

 35 N. , 140 to 150 E. (sea area east of the Izu Islands). There are only a few data for July 

 fronn this sea area, but the striped marlin catch rates are not very high. The nnaxinnum catch 

 rates for this sea area appear in October. The broadbill catch rates show high values for 

 October and March in the area east of the Imu Islands, with the nnaxinnunn in March. In this sea 

 area the nnaximunn catch rate is attained in January. In the area of 25 to 30 N. , 150 to 160 E. 

 a rather high value is shown for March. The shark data for various species have been lunnped 



120 



