Table 1.) The data are few, but it appears that seasonally the fishing is 

 somewhat better during the northeast tnonsoono Fishing becomes most active 

 around November, the time when the seasonal winds change and the movements 

 of the schools seem to be at their height, but we have as yet no detailed 

 knowledge concerning this point. 



(b) Coastal waters of Java (6° - lO'^S, 105° - 115°E) 



The catch rates and catch composition in this area are entirely 

 different from those of the contiguous sea areas to the east and west. 

 During the northeast monsoon current boundaries appear in the vicinity 

 of the Sunda Strait to the west and the Lombok Channel to the east, and 

 the coastal waters of Java have water masses that are altogether dif- 

 ferent from those of the contiguous seas (Figure 2), To the east (coastal 

 waters of the Lesser Sundas) and west (coastal waters of Sumatra) of these 

 current boundaries extremely dense schools of fish are distributed^ The 

 coastal waters of Java show the peculiarity of water temperatures markedly 

 lower than those of the adjoining areas, and it is thought that the 

 occurrence of schools in this low temperature zone is sparse „ Although 

 there is a certain amount of fishing in this area, it is limited to the 

 vicinity of eastern and western fringeSj and in the central section almost 

 no fish are takeno 



The situation during the southwest monsoon is not known, but since 

 the currents belong to the same system as those of the coastal waters of 

 the Lesser Sundas it is presumed that the occurrence of the fish is 

 probably fairly dense » 



(c) Coastal waters of Sumatra (6°N - 6°S, 90° -= 105°E) 



The catch rates are amazingly higho Big-eyed tuna occur abundantly 

 throughout the low latitudes, and are rather abundant everywhere in the 

 area, though not as much so as in the South Seas Government-Generals The 

 spearfishes do not appear to be too numerous^ In general a tendency can 

 be perceived for the big-eyed tuna to be most abundant around December, 

 gradually decreasing thereafter as the spearfishes become more numerous, 

 the latter reaching their peak of abundance around February. (See Table 9o) 



The northern and southern areas are clearly divided by a current 

 boundary in the neighborhood of the Equator (see the dotted line on 

 Figure 2) with the results shown in the following table o 



There is a marked difference both in the catch rates and in the 

 size of the yellowfin. 



29 



