United Statas Department of the Interior 

 Oscar L„ Chapvnan, Secretary 

 Fish and 1E.ldlife Service 

 Albert M„ Day, Director 



Special Scientific Report - Fisheries 

 No„ 52 



ON THE JAPANESE BLACK TUNA (THUNNUS ORIENTALIS) 



Translated from the Japanese language by 



Wo Go Van Campen 

 Pacific Oceanic Fishery Investigations 



CONTENTS 



1. On the estimation of favorable temperat-oxs for long-line 

 fishing of tunny p By Michitaka Uda l/ <> „ „ » „ o . o . » . , . » . . . 



I^ge 



2. The catch_of tunny, Thunnus orie.ntalis (T„ & S,), off Kushiro, 



Hokkaido, in relation to the vertical difference in water 

 temperature, By Takeshi Kawana 2/ » o . » . . » » . » . . o 12 



3. Homogeneity of the groups of black tuna in the Satsunan Sea 



area. By Tatsuzo Mine (Myazaki Prefecture Fisheries 

 Experiment S-GaT.ion) and Satoru lehisa (Miyazaki Prefecture 

 Commercial Fisheries Department) "^ ooo «<,..« 17 



1/ From the Bulletin of the Japanese Society of Scientific Fisheries, 

 Volume 4., Number lo May 1935o 



2/ (Hokkaido Fisheries Experiment Stationo Fukui Prefecture Fisheries 

 Experiment Station) From Bull„ Japc Soc„ Sci. Fish., Vol, 6, No„ 2, 

 pp. 73-7^, July 1937. 



^' From Bulletin of the Japanese Society for Scientific Fisheries, Vol, 8, 

 Noo 6, pp„ 292-29^.0 Marehj 194-0. 



