Figure 4. — The expansion of Japanese longline fishing 

 grounds in the Pacific Ocean shown at 5-year intervals 

 (from Kume. in press). 



Figure 5. — The expansion of Japanese longline fishing 

 grounds in the Indian Ocean (adapted from Kikawa et al. 

 1969). 



Coral Sea. In the next 5-year period, 1956-60. the 

 fishing grounds expanded eastward along the 

 equator to near the Central American coast, with 

 yellowfin tuna and bigeye tuna as the principal 

 species being taken. The fishery also extended the 

 bigeye tuna fishing grounds in waters northeast of 



■q^ 



o-e acre s 



Figure 6. — The expansion of Japanese longline fishing 

 grounds in the Atlantic Ocean. 



Hawaii and at this time began taking striped marlin 

 of the northeastern Pacific. 



Between 1961 and 1965, the fishing grounds 

 moved farther eastward into the American coastal 

 waters. There was also an expansion in the north- 

 eastern and southern directions. This expansion re- 

 sulted in complete coverage of the distribution of 

 striped marlin in the Pacific Ocean. The blue marlin 

 of tne southeastern Pacific, along lat. 20°S and be- 

 tween long. 130° and 150°W also began to be taken. 

 The expansion of grounds after 1965 was largely for 

 southern bluefin tuna in the higher latitudes of the 

 South Pacific. 



As for future developments in the Pacific, we may 

 be able to look forward to further developments of 

 the swordfish resources along the coasts of South 

 America and Australia. 



Indian Ocean 



The expansion of the longline fishing grounds in 

 the Indian Ocean is shown by 2-year intervals (Fig. 

 5). In 1952 the yellowfin tuna grounds around the 

 Lesser Sunda Islands began to expand westward and 

 by 1956 had reached the African coast. By 1958 the 



