PLANKTON VOLUMES 

 MAY 1957 



CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 

 34-100 

 ^P 101-300 

 ^1 301-900 

 Hj OVER 900 

 o STATIONS OCCUPIED 



Figure 8. — Plankton volumes, May 1957 



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