176 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Sable from river drainage areas where rich phos- 

 phate deposits are known to exist renders this 

 explanation doubtful. Ocean drifts seem to be 

 northward in the region involved, though informa- 

 tion on shore circulation and surface wind drifts 

 is lacking. 



The problem of the red tide as presented leaves 

 a great deal of room for scientific investigation. 

 The physiology, metabolism, and tactic responses 

 of Gymnodinium brevis must be understood, and 

 the source and mode of distribution of increased 

 nutrients determined before it is possible to sug- 

 gest a solution or remedy. 



LITERATURE CITED 



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