Nakagome, J. 1961. Seasonal variation of swimming 

 layer of yellowfin tuna by area of different 

 currents in mid-western and southwestern parts of 

 the Pacific Ocean. Bull. Jpn., Soc. Sci. Fish. 

 27:302-306. 



Compared the seasonal variation in the swim- 

 ming layer and among areas of the fisheries 

 off northeast Australia and New Guinea. 



KEY WORDS: tuna, yellowfin, habitat, depth, 

 convergence, currents, season. 



Nakagome, J. 1965. On the seasonal variation of swim- 

 ming layer of yellowfin tuna, big-eyed tuna and 

 blue marlin in the area of Caroline and Marshall 

 Islands - IV. Seasonal variation of water tem- 

 perature by depth. [In Jpn.] Bull. Jpn. Soc. Sci. 

 Fish. 31:781-784. 



Seasonal variations in water temperatures at 

 the surface and 50 m were different than 

 those of 150, 200, and 300 m. Compared 



values among years. 



KEY WORDS: tuna, bigeye, season, depth, 

 temperature, habitat. 



Nakagome, J. 1965. On the seasonal variation of swim- 

 ming layer of yellowfin tuna, bigeye tuna and blue 

 marlin -in the area of Caroline and Marshall 

 Islands - V. Relation between seasonal variation 

 of depth of swimming layer and that of depth of 

 water temperature layer. [In Jpn., Engl, summ.] 

 Bull. Jpn. Soc. Sci. Fish. 31:785-788. 



Swimming depths of yellowfin and bigeye 

 seemed related to the seasonal variation of 

 the depth of 28°C water. Swimming layers 

 were presumed to be 50 to 70 m deep for 

 yellowfin and bigeye. Presented charts of 

 the seasonal variation in the depth of the 

 layers for the species considered. 



KEY WORDS: tuna, yellowfin, bigeye, tempera- 

 ture, depth, habitat, season. 



60 



