Okachi , I. 1963. Studies on the distribution and 

 structure of the fish fauna in the Japan Sea by 

 catch statisitics. 2. Supplement of seasonal 

 distribution and fishing condition of the bluefin 

 tuna. [In Jpn., Engl. summ. ] Bull. Jpn . Sea 

 Fish. Res. Lab. 11:9-21. 



Considered seasonal variation in catch. 

 Attributed the fall increase in catch as 

 being due to transportation by the current 

 under the influence of westerly winds. 



KEY WORDS: tuna, bluefin, season, catch, mi- 

 gration, size/age, currents, wind. 



Okiyama, M. 1974. Occurrence of the postlarvae of 

 bluefin tuna, Thunnus thynnus , in the Japan Sea. 

 Bull. Jpn. Sea Reg. Fish. Res. Lab. 25:89-97. 



Three post-larval bluefin were captured and 

 presumed to have been spawned in the Japan 

 Sea. Case was considered unique and related 

 to unusually warm-water conditions, and of no 

 significance to stock. 



KEY WORDS: tuna, bluefin, larvae, spawning, 

 temperatures, stock. 



Okiyama, M. , and S. Ueyanagi. 1977. Larvae and juve- 

 nile of the Indo-Pacific dog-tooth tuna, Gymno- 

 sarda unicolor (RUppell). Bull. Far Seas Fish. 

 Res. Lab. (Shimizu) 15:35-50. 



Described the development of larval and juve- 

 nile tunas. Included data on depth and tem- 

 perature at capture. Presented some evidence 

 of diurnal vertical migration. Spawning was 

 evidenced over most of year. 



KEY WORDS: tuna, dog-toothed, temperature, 

 depth, season. 



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