PLANKTON VOLUMES 

 MARCH 1957 



CC or PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 



34-100 



101-300 

 ■ 301-900 

 H OVER 900 

 o STATIONS OCCUPIED 



Figure 6. — Plankton volumes, March 1957 



16 



