PLANKTON VOLUMES 

 FEBRUARY 1957 



CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 

 34-100 

 ^P 101-300 

 ^M 301-900 

 ^1 OVER 900 

 o STATIONS OCCUPIED 



Figure 5. — Plankton volumes, February 1957 



12 



