Kamimura, T. , and M. Honma. 1963. Distribution of the 

 yellowfin tuna ( Neothunnus macropterus [Temminck 

 and Schlegel]) in the turTa long line fishing 

 grounds of the Pacific Ocean. [In Jpn., Engl, 

 abstr.] Rep. Nankai Fish. Res. Lab. 17:31-53. 



Longline hooking rate for yellowfin attained 

 a maximum near the equator in the west and 

 central Pacific and decreased toward higher 

 latitudes. Yellowfin were found principally 

 in the South Equatorial Current, bigeye in 

 North Equatorial Current suggesting environ- 

 mental differences to which each is sensi- 

 tive. Temperature did not seem to be a con- 

 trolling factor. Yellowfin distribution 

 showed only a small seasonal variation in the 

 equatorial region. Seasonal peaks did appear 

 in the catch at higher latitudes in the west 

 Pacific. Noted a west-to-east gradient of 



increasing size of yellowfin across the 

 Pacific. Young fish were in high densities 

 around islands and near land. 



KEY WORDS: tuna, yellowfin, bigeye, season, 

 size, catch, temperature, currents, distri- 

 bution, population. 



Kanagawa Prefectural Fisheries Experimental Station. 

 1952-1956. Table of survey of tuna catches by 

 months and by fishin_3 area^ [In Jpn.] Kanagawa- 

 ken Suisan Shikenjo Geppo (Mon. Rep. Kanagawa 

 Pref. Fish. Exp. Stn.) Nos. 1-43. 



World-wide catch data from Japanese longline 

 boats; include data on effort, sampling 

 coverage, and water temperature. 



KEY WORDS: tuna, catch, distribution, 

 season, temperature. 



38 



