Table 79. --Fishing condition« on either side of 40 N. 

 (northeastern sea area) 



As the foregoing table shows, fishing is very different north and south of 40 N. The 

 southern part has a markedly lower value for the black tuna catch rate than the northern section, 

 but notably higher catch rates for all the other species. Besides the tunas cind speajrfishes, 

 there was a catch of 182 sharks in the north and 1, 705 sharks in the south. Consequently, the 

 shark catch rate was 0. 51 in the northern section and 1. 87 in the south. 



In the following table this sea area has been split up into five sections of 2 

 longitude and the fishing conditions for each have been shown separately. 



of 



Table 80. --Fishing conditions by sections (northeastern 

 sea area, 35 to 40 N. ) 



Looking at local changes in fishing conditions from east to west without considering 

 the season, one cam detect a trend in the foregoing table for the catch rates of both albacore and 

 spearfishes to innprove as one goes eastward. However, in the case of the other species, it is 

 difficult to see any trends in the local variations in fishing conditions. 



Table 81 shows the fishing conditions by sections in the part of the area north of 40 

 N. A thorough inquiry is not possible because of the paucity of the data, but it can be seen that 

 black tuna axe taken only west of 144 E. The spearfishes appear to show a tendency to increase 

 to the ecLStward just as they did south of 40 N. The airea where the greatest numbers of black 

 tuna are taken is approximately off Erimo Misaki. 



by monthi 



In order to see seasonal changes in the fishing conditions, the data have been shown 

 in table 82. 



114 



