Figure 8. Yellowfin Tuna Catch/ 100 Hooks (July- 

 Novemter). As mentioned previously, we do not yet have enough 

 crossings to plot the distribution for all times of the year. How- 

 ever, when we group together a set of 10 crossings made in August, 

 September, October, and November (of three different years), we 

 can draw a very generalized picture of the concentration in terms 

 of number of yellowfin tuna caught per hundred hooks per day. We 

 have drawn lines through equal catches. The "9-line" encloses the 

 area yielding 9 or more yellowfin per hundred hooks; between the 

 9-line and the 6-line the catches averaged 7 to 8 per hundred hooks, 

 etc. You can see that at 150° W. longitude the fishing was , ssi: in a 

 zone centering at about 2° N. latitude running east to about 145° W. 

 longitude and west to 160° W. longitude. It tapers off rapidly going 

 north or south and more gradually going east or west. 



