VI-112 



biotin, thiamin), light (photo-period, intensity, spectral distri- 

 bution), temperature (ranges, optimum, rate of change), pH (range, 

 optimum, rate of pH change adaptation), and eH (ranges, optimum, and 

 rate of eH change adaptation). 



Determination of the amount and chemical identification of 

 naturally occurring anti -metabolites present in sea water and 

 determination of their effects upon the abundance and distribution 

 of important phytoplankton soecies should be made. Information 

 so derived could be very useful for manaqina water quality that 

 would inhibit undesirable organisms. 



Water Quality Requirements for Recreation 



Water quality research should not be dominated by concern for 

 fish and shellfish alone but should also give a major considera- 

 tion of water quality requirements for the preservation of aesthe- 

 tic and recreational uses of the estuarine and near-shore areas. 

 The need for intensive research on water quality requirements for 

 recreation is directly related to the optimum recreational carrying 

 capacity of the estuarine area. This is oarticularly true for the 

 effect of multipje pollutants acting at the same time in the same 

 location. Consideration should also be given to oublic health 

 implications; for example, the present col i form criteria 

 for oyster production areas is highly questionable in the light 



