5°E 



5°N 



5°E 



FISHERY BULLETIN: VOL. 75, NO. 4 

 10° 15° 



20° 



FIGURE ll. — Location of sightings of schools of skipjack tuna 

 during October-November 1968 plotted on the observed ocycline 

 (3.5 ml/1) topography. 



FIGURE 13.— Location of sightings of schools of skipjack tuna 

 (dots) and habitat thickness i meters) from Undaunted and 

 Rockaway data, October-November 1968. 



Z=DEPTH(m) TO OXYCLINE ( 3 5 ml / liter ) 

 »o 



FIGURE 12. — Relationship between skipjack school sightings 

 and oxycline depth from Undaunted and Rockaway data for 

 October- November 1968. 



THICKNESS OF HABITABLE ENVIRONMENT (M) 



FIGURE 14. — Relationship between skipjack school sightings 

 and habitat thickness from Undaunted and Rockaway data for 

 October-November 1968. 



864 



