Table J . --Concentrations of G^. breve in neritic 



southwest Florida 



and estuarlne waters along the 

 coast 



General locality 



Date Time 

 (1957) (EST) 



Depth 



Average per liter 



Number 



Buoy No. 1 Egmont Channel 10/6 



Off Longboat 



Off New Pass 



Off Big Sarasota Pass 



Off Midnight Pass 



Off Venice Inlet 



\/^ mile west. of Stump Pass 



VS mile west of Gasparllla Pass 



Boca Grande Pass 



Captiva Pass 



Redfish Pass 



Buoy No. 2 Egmont Channel lO/ll 



1 mile east Buoy No. 1 



Egmont Chajmel 

 Buoy No . 1 Egmont Channel 



1-1/2 miles east Buoy No. 1 



Egmont Channel 

 Buoy No. 2 Egmont Channel 10/23 



Bell Buoy Southwest Channel 



Off Longboat Pass 



Off New Pass 



Off Big Sarasota Pass 



Off Midnight Pass 



Off Venice Inlet 



"'" S = surface. 

 ^ B = bottom. 



36.9%o and most frequently from 31.0-34.9%o 

 (table 2). Aldrich and Wilson (1960) observed 

 no instances of optimal growth in cultures 

 below 24%o and considered the salinity range 

 27-37%o best for the organism in laboratory 

 experiments. The main differences between 

 their work and our field data may result from 

 the relatively few water sannples in our low 



salinity range. In nature the organism is also 

 subjected to a more gradual salinity change. 



Temperature data indicate that the organism 

 can survive a relatively wide temperature 

 range and is limited only by high or low water 

 temperatures. The most favorable tempera- 

 ture range for ^. breve blooms appears to be 

 14.0°-25.9° C. (table 2). This may account for 



11 



