together, ao it is not possible to judge the fishing conditions for each species from the table. 



It can be seen that the catch rate tends to be high around October both in the sea area east of the 



Izu Islands and at 30° to 35° N. , 150° to l60° E. 



Table 89. --Comparison of fishing conditions for spear 

 fishes and sharks (25 to 30° N, 1^50° to 

 160° E; 30° to 35° N, " 



35° N. , 150° to 160° E.) 



140° to 150° E: 30° to 



Note: (1) The striped marlin colunan includes some black marlin and sadlfish. 



In the case of both the tunas and the spearfishes, it appears that fishing conditions in 

 this sea area differ somewhat from those in the sea areas lying adjacent on the west and south. 

 In general the maun fishing season for this sea area is in the winter, with striped marlin rather 

 abundant around October, striped marlin and broadbill present in about equal numbers around 

 December, and broadbill predominating thereafter. The albacore, which is the principal element 

 in the catch, increases suddenly after December and reaches the peak of its fishing season in 

 January and February. 



(b) 160° to 170° E. 



longitude 



The data for this sea area are summarized in table 90. The overall average catch 

 rate is slightly less than I 1. 1. As the table shows, the main element in the catch is the albacore, 

 making up 93 percent of the whole. It is followed in importance by the bigeye tuna, and spear- 

 fishes are scarce. Black tuna and yellowfin are vestigial. 



Table 90. --Fishing conditions at 30 to 35 N. 

 to 170 E. 



160 



121 



