PLANKTON VOLUMES 

 APRIL 1960 



CC. OF PLANKTON PER IPOO M; 

 OF WATER STRAINED 



1-33 

 34-100 

 m^ 101-300 

 m 301-900 

 m OVER 900 

 o STATIONS OCCUPIED 



Figure 7. — Plankton volumes, April 1960. 



22 



