o 

 o 



X 



o 

 o 



o: 



iij 



Q. 



X 



o 



4.0 



3.5 



3,0 



Z5 



2.0 



1.5 



1,0 



"T 1 1 1 1 1 1 1 r 



-I i r 



YELLOWFIN 



5 6 7 8 



10 II 12 13 14 15 16 17 18 19 20 21 22 23 



DATE 



FIG I CATCHES OF BLACK MARLIN AND YELLOWFIN TUNA FROM 6° N LATITUDE, 



178° E LONGITUDE DURING OCTOBER 1951, THE CATCH RATES PLOTTED AGAINST 

 THE CORRESPONDING DAY OF THE MONTH ARE BASED ON LONGLINE SETS 

 OF APPROXIMATELY 2,000 HOOKS. 



6 



