PLANKTON VOLUMES 

 JUNE 1957 



CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 



34-100 

 ^B 101-300 



^M 301-900 

 H OVER 900 

 o STATIONS OCCUPIED 



Figure 9. — Plankton volumes, June 1957 



32 



