STATION A 



STATION D 



79 



78 



77 

 Ll- 



o 76 



75 

 74 



35.2 



35.0 



jl 34.8 



34.6 



34.4 



SURFACE TEMPERATURE 



en 

 cr 



.40 

 .30 

 .20 

 .10 

 

 10 

 20 

 30 

 40 



URFACE SALINITY 



SURFACE PHOSPHATE 



SECCHI DISK 



Figure 9. --Variations in surface temperature, surface salinity, surface phosphate 

 Secchi disk visibility (station A only), thernnocline depth, and zooplankton volumes 

 at stations A and D, located at the positions shown in figure 4, as compared with 

 the weekly skipjack catch of the Hawaiian pole-and-line fishery for the same period 

 of time, April to November 1953. 



13 



