20' 



130" 



130' 



AVERAGE 

 PLANKTON VOLUMES 



1958 COMPARED TO 1957 AND 1951-1956 AVE 



m 



Q 



JAN FEB MAft APRIL MAT JUNE JULY AUG 



1951 thru 1956 I 



1957 I 



1958 iir 



I I 



/ 



/ 



/ 



Figure 2.--Average plankton volumes in 1958 compared with average volumes 1951-1956, and average volumes in 1957. 



by month and area. 



