The fifth report (Dragovich, 1961) presents 

 counts of G. breve with associated plankton 

 and hydrological data at Naples, Florida, for 

 the period from March 1956 to August 1957. 



Hutton (1956) listed most of the earlier pub- 

 lications pertaining to the Florida red tide. 

 More recent contributions dealing with the 

 Florida red tide were made by Wilson and 

 Ray (1956), Bein (1957), Ray and Wilson (1957), 

 Collier (1958), Rounsefell and Evans (1958), 

 Ingle, Hutton, Shafer, and Goss (1959), Aldrich 

 and Wilson (I960), Hutton (1960), Dragovich 

 and May (1962) and Dragovich (1963). 



This report presents the continuation of the 

 data from part II by Dragovich, Finucane, and 



May (1961). The data in this report were ob- 

 tained from the 25 regular stations located in 

 Tampa Bay and adjacent neritic waters extend- 

 ing to 40 miles offshore distance (figs, land 2). 

 Occasionally two special stations were sampled 

 at 50 and 60 miles offshore distance (figs. 

 1-2). 



During the period of this report two minor 

 outbreaks of red tide occurred in our investi- 

 gation area. The first was observed in March 

 1960 and the second during July and August of 

 the same year. Both of these outbreaks were 

 confined mainly to an area from the mouth of 

 Tampa Bay to 35 miles offshore, and little 

 fish mortality was observed. 



84" 83° 82" 81" 80' 



Figure 1. --Index map of southern Florida with outline of investigation area. 



