-o 



c 

 o 

 v> 



o 



X 



o 



!5 



o 



o 



I- 



80 

 60 

 40 

 20 



JACK MACKEREL 



DAY INDEX 



• NIGHT INDEX 



TOTAL CATCH 



J I I _T ' -■— I aJ — .-—^- I 



5 

 4 



w 



1963 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 



YEAR 



Figure 46. —Jack mackerel index values in arbitrary units for day and night observations and total California catch. 



58 



