Kawasaki, T. , M. Yao, M. Anraku, A. Naganuma, and M. 

 Asano. 1962. On the structure and the fluctua- 

 tion mechanism of the piscivorous fish community 

 distributed in the subsurface layer of the Tohoku 

 Sea region. I. [In Jpn . , Engl, summ.] Bull. 



Tohoku Reg. Fish Res. Lab. 22:1-44. 



[Not read.] 



Kearney, R.E. 1978. Some hypotheses on skipjack ( Kat- 

 suwonnus pelamis in the Pacific Ocean. South Pac . 

 Coram., Noumea, New Caledonia, Occas. Pap. 7:1-23. 



Distribution of larvae, juveniles and young, 

 and adults in relation to the environment; 

 physiological limitations with regard to en- 

 vironment; popul at ion-subpopul at ion-stock 

 definition, description, and distribution. 

 Discussion on stock assessment. 



KEY WORDS: tuna, skipjack, distribution, 

 population, stock, growth, environment, lar- 

 vae , migration . 



Kikawa, S. 1957. The concentrated spawning area of 

 bigeye tuna in the western Pacific. [In Jpn., 

 Engl, abstr.] Rep. Nankai Reg. Fish. Res. Lab. 

 5:145-157 



A study based on gonad indexes in different 

 areas. Relative abundance curves of three 

 groups appeared to coincide with ocean cur- 

 rent basins, with curves crossing at points 

 which coincided with current boundaries. 

 Ocean currents were considered to have defi- 

 nite ecological significance to tunas: big- 

 eye being found in the North Pacific Current 

 in the resting stage; bluefin in the North 

 Equatorial Current were recent spawners. The 

 most mature group was dominant in the Equa- 

 torial Countercur rent so that spawning areas 

 of bigeye lay in that current. Fish were re- 

 cruited from north to south in the North Pa- 

 cific with the reverse in the South Pacific. 

 No good data were available for yellowfin, 

 but spawning seemed to occur in the South 

 Equatorial Current area. 



KEY WORDS: tuna, yellowfin, bigeye, bluefin, 

 distribution, spawning, age, migration, sea- 

 son, currents, boundaries. 



43 



