PLANKTON VOLUMES 

 APRIL 1959 



CC OF PLANKTON PER IOOO M J 

 OF WATER STRAINED 



0-33 

 34-100 

 101-300 

 ^ 301-900 



OVER 900 

 o STATIONS OCCUPIED 



Figure 7. --Plankton volumes. April 1959. 



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