PLANKTON VOLUMES 

 JANUARY 1957 



CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 



34-100 

 ^^ 101-300 

 ^m 301-900 

 ^M OVER 900 

 o STATIONS OCCUPIED 



Figure 4. — Plankton volumes, January 1957 



10 



