10.000,000 1- 



1,000,000 - 



100.000 - 



10.000 



LITTLE PASS 



G. BREVE COUNTS 

 •-PLANE SAMPLES 

 LETHAL CONC. 



SEPT. OCTOBER 



Figure 18. — Numbers of red tide organisms per liter off Little pass. 



10.00 r 



to 



o 



I- 

 < 



< 



o 

 o 



I 



(£ 

 UJ 

 0. 

 Q. 

 O 

 U 



1.00 



.10 



.01 - 



JOHNS PASS 



SURFACE WATER SAMPLES 

 SEPTEMBER 27,1957 



• •• 



t • • • • 



• • 





I I I L 



-L 



5 10 20 30 40 50 



NUMBER CFG. BREVE /l (-0000) 



70 



100 200 



Figure 19. —Microgram atoms of copper per liter off John's Pass and number of red tid 

 organisms per liter. Empirical curve shows that number of organisms was 

 reduced at higher levels of copper. 



56 



