Sato, T. , S. Mishima, K. Shimazaki , and S. Yamamoto. 

 1964. On the oceanographical condition and the 

 distribution of tuna fish in the Coral Sea in 

 December, 1962. [In Jpn., Engl, summ.] Bull. Fac . 

 Fish. Hokkaido Univ. 15 (2 ): 89-102 . 



Results from a training ship cruise. Observed 

 a relation between the catch of tunas and 

 current systems. Catches were larger north 

 of a convergence. The authors concluded that 

 albacore were in a southward migration and 

 part of a northern population which spawns 

 later in the region. 



KEY WORDS: tuna, albacore, catch, oceanog- 

 raphy, currents, convergence, temperatures, 

 depth, salinity. 



Schaefer, M.B. 1961. Tuna oceanography programs in 

 the tropical central and eastern Pacific. Calif. 

 Coop. Oceanic Fish. Invest. Rep. 8:42-44. 



A brief review of the knowledge to date of 

 tuna-oceanography in the specified area. 

 There was a good correspondence between the 

 abundance of tunas and production of orga- 

 nisms lower in the food chain, related to en- 

 richment of the euphotic zone from below. At 

 the extremes of their ranges--at least in the 

 eastern tropical Paci f ic--there appeared to 

 be a direct effect of temperature on tropical 

 tunas. On a small scale, the fishes associ- 

 ated with sea surface temperature discontinu- 

 ities or fronts. 



KEY WORDS: tuna, yellowfin, skipjack, big- 

 eye, albacore, oceanography, food, fronts, 

 temperature, enrichment, water mass, conver- 

 gence . 



74 



