Nakagome, J. 1958. On the seasonal variation of swim- 

 ming layers of yellowfin tuna, big eyed tuna and 

 black marlin in the area of Caroline and Marshall 

 Islands. 3. On the relationship between seasonal 

 variation of swimming layer and rate-of-catch . 

 [In Jpn., Engl, summ.] Bull. Jpn. Soc. Sci. Fish. 

 24: 173-175. 



Variation of catch rate of yellowfin and 

 bigeye correlated with depth of the swimming 

 layer. When the depth from the surface to 

 the swimming layer was shallow catch rate was 

 high; when deep it was low. 



KEY WORDS: tuna, yellowfin, bigeye, catch, 

 habitat, depth. 



Nakagome, J. 1960. On the cause of annual variation 

 of fishing condition of bigeye tuna in the area 

 from Marshall Islands to Palmyra Island. 3. Rela- 

 tion between monthly and annual variations of 

 fishing condition and those of surface water tem- 

 perature of the fishing ground. [In Jpn., Engl, 

 summ.] Bull. Jpn. Soc. Sci. Fish. 26:406-407. 



Monthly and annual variations of fishing con- 

 ditions for bigeye and sea surface tempera- 

 tures were considered. A direct relation be- 

 tween sea surface temperatures and the annual 

 variations in catch could not be found. 



KEY WORDS: temperature, bigeye, season, 

 catch, oceanography, temperature. 



Nakagome, J. 1960. On the cause of annual variation 

 of fishing condition of bigeyed tuna in the area 

 from Marshall Islands to Palmyra Island. 5. Re- 

 lation between appearance of dominant age group of 

 bigeyed tuna and surface water temperature in 

 spawning and larvae cultivated area. [In Jpn., 

 Engl. summ.] Bull. Jpn. Soc. Sci. Fish. 

 26:472-475. 



Discussed the variation in annual sea surface 

 temperature and age frequency of bigeye 

 caught on lingline. Observed different 

 periods of high and low temperatures on the 

 fishing grounds between years and seasons. 



KEY WORDS: tuna, season, bigeye. 



Kt Y wuKUb : cuna , 

 temperature, catch, age. 



59 



