AVERAGE PLANKTON VOLUMES 



CC. OF PLANKTON PER 1,000 M 

 OF WATER STRAINED 



1-33 



34-100 



101-300 

 11 301-900 

 IQ OVER 900 

 o STATIONS OCCUPIED 



130° 



Figure 2.— Average plankton volumes, 1960. 

 4 



