ABSTRACT 



A study has been carried out by the Washington 

 Department of Fisheries to determine the contribution 

 from phytoplankton photosynthesis to the dissolved 

 oxygen content of the waters of Grays Harbor. It was 

 found that phytoplankton photosynthesis Is Inhibited 

 In Upper Grays Harbor because of water turbidity and 

 some undetermined Inhibiting factor. Sulfite waste 

 liquor contributed to the turbidity and was a factor 

 In the low Inorganic phosphate content of the water. 

 It was calculated that the waters of Upper Grays 

 Harbor failed to receive about 1.7 parts per million 

 (ppm) of dissolved oxygen every 10 days during summer 

 due to the reduced phytoplankton photosynthesis. 



Ill 



