PLANKTON VOLUMES 

 MARCH 1958 



CC OF PLANKTON PER 1000 CM 

 OF WATER STRAINED 



0-33 



34-100 

 ^M 101-300 

 m 301-900 

 ^M OVER 900 



STATIONS OCCUPIED 



Figure 6.--Plankton volumes, March 1958. 



19 



