at the mouth of Tampa Bay to 35.79%o, 20 miles offshore. The organism was 

 not found in waters having salinities less than 29. 29%o or greater than 36. 26%o. 

 The relatively stenohaline character of this dinoflagellate suggests that it sub- 

 sists in the neritic waters. 



Water temperatures during blooms of this organism ranged frona 

 about 28° to about 30° C. This was almost 2° C. higher than the temperatures 

 associated with G. breve blooms last year. G. breve was not found below 

 14. 42° C. or above 31. 32° C. These organisms occurred in only 6 percent of 

 the samples below 18° C. as compared to 33 percent between 18°-23° C. and 

 52 percent between 21°-31°C. Thus, the greatest incidence of this organism 

 in the fall and spring may be due to the more favorable water temperature at 

 these times. 



Taking water samples with modified Van Dorn bottles 

 from aft deck of KINGFISH. 



63 



