Ceratium fusus: Three areas of high population density 

 (1300 at 8 feet, 1600 at 48 feet, and 0400 at 18 feet) (fig. 24) 

 fell within or very close to the most turbid zones. A fourth 

 concentration (2400 21 July at 38 feet) showed no relation- 

 ship to light attenuation and emphasized that greater con- 

 centrations must be present before light transmission is 

 significantly affected. 



1000 1400 1800 2200 0200 



TIME (HOURS) 



0600 



1000 



Figure 24. Distribution of Ceratium lusus (organisms per ml), with transparency data (percent transmission) 

 in red, Operation II. 



43 



