y) 10 — 



"1 — I — \ — r 



YELLOWFIN 



1. ^ 



1 — \ — I — I — I — I — r 



J 



UJ 400 - 



S— LATITUDE — N 



Figure 4. --Temperature section and yellowfin tuna catch along 140 W. 

 longitude, August-September 1952. If no yellowfin were 

 taken, a zero is shown in the upper panel. The breaJ^ in 

 the isotherms represents a 17-day interval between adjacent 

 observations. 



