Yamanaka, H. 1969. Relation between the fishing 

 grounds of tuna and the equatorial current system. 

 [In Jpn . , Engl, abstr.] Bull. Jpn. Soc. Fish 

 Oceanogr., Spec. No., p. 227-230. 



Discussed the relation between tuna distribu- 

 tions and currents, water type and thermal 

 structure, productivity and equatorial circu- 

 lation and structure, fluctuations of fish- 

 eries and oceanographic conditions. 



KEY WORDS: yellowfin, bigeye, oceanography, 

 water type, currents, temperature. 



Yamanaka, H. and N. Anraku. 1961. Relations between 

 the distribution of tunas and water masses of the 

 North and South Pacific oceans west of 160 W. Iji 

 J.C. Marr (editor), Pacific Tuna Biology Confer- 

 ence, August 14-19, 1961, Honolulu, Hawaii, p. 

 41-42. U.S. Fish. Wildl. Serv., Spec. Sc i . Rep. 

 Fish. 415. 



Water masses were defined by the T-S rela- 

 tion, and an approximate relation is shown 

 between the occurences of tunas and surface 

 water types. 



KEY WORDS: tunas, albacore, bigeye, yellow- 

 fin, oceanography, water masses, temperature, 

 salinity, season. 



Yamanaka, H., Y. Kurohiji, and J. Morita. 1966. Gen- 

 eral results of the investigation in the South 

 Western Pacific Ocean by the fish-finder. [In 

 Jpn., Eng. summ.] Rep. Nankai Reg. Fish. 



jpn . , tng . summ. j 

 Lab. (24) :115-127. 



Res 



A report of research vessel data on hydro- 

 graphy, eggs and larvae of yellowfin, and 

 deep scattering layer studies. Yellowfin 

 shoals were found distributed in correspon- 

 dence with oceanographic structures; the 

 swimming layer of yellowfin was above the 

 depth of the thermocline. 



KEY WORDS: tuna, yellowfin, skipjack, depth, 

 habitat, distribution, oceanography, cur- 

 rents, thermocline, feed. 



93 



