Retesting the most active group of potential control agents indicated 

 each of 88 organics to be at least as toxic as copper sulfate to this organism. 

 Tests to determine the degree of specificity of these poisons will begin soon. 



A large portion of time was devoted to preparing manuscripts to make 

 available in publications the mass of information collected in prior years. A 

 report was also prepared for the Corps of Engineers on the relationship" between 

 Caloosahatchee River discharges and red tides. Our report suggests that in- 

 creased annual volume of discharge favors red-tide development, but short- 

 term variation has no such effect. 



Chemistry laboratory at St. Petersburg Beach, Florida, field station. 



57 



