The catch rate for big-eyed tuna gradually declines from 

 January to Aprils rises to a low peak in Julys and is at its 

 highest for the year from October to December. If this is 

 compared to figure 25B, it seems that the maximum and minimum 

 appear about 1 to 3 months latere 



In the case of the spearfishesp there is an extremely 

 conspicuous peak in May.. In this area the catch in April and 

 Kay is usually mainly striped marlin,, while from June to August 

 the black marlin are on the increase. Since, however, the 

 records are not clearly defined by species, it is difficult to 

 elucidate the catch situation for each specieso 



The foregoing deals with movements of the schools 

 extending over long periods of timeo The data obtained by 

 the Haruna Maru(227 on fishing conditions off the Indian Ocean 

 coast of Sumatra near the Equator are presented in the following 

 figToreo 



Table 13 



Fishing Conditions in the Coastal Waters 

 of Sumatra near the Equator (Haruria Maru, 1932J 



Notes* (l) The catch rates represent the number of yeliowfin and big-eyed 

 tuna per 100 hookso 



(,22; rpj^g Haruna Maru (1,537 tons) was converted for use as an 

 experimental tuna camierj' ship, and operated in 1932 and 

 1933, chiefly in the Indian Ocean area. 



93 



