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bird study of waterfowl, gull, and shorebirds. Because it is illegal to 

 discharge firearms within the city of San Diego, there is no waterfowl 

 hunting on the bay. 



The quality of Mission Bay waters depends primarily on the physi- 

 cal characteristics of the bay. The temperature, clarity, and dissolved 

 oxygen concentration in the entrance channel tends to approximate 

 that of the adjacent ocean. Atlhough dissolved oxygen nitrates and 

 phosphates are low, the presence of phytoplankton and suspension of 

 bottom materials caused by water motion contribute to turbidity. As 

 measured by coliform indicators, the bacterial quality of Mission Bay 

 is excellent. 



There is virtually no direct discharge of waste to Mission Bay ex- 

 cept for overflow from Sea World's display tanks, and infrequent 

 overflows from the municipal sewerage system and boats. The use of 

 marine heads in the bay is discouraged. There are drying beds for 

 liquid digested sludge on Fiesta Island. Their use conforms to the 

 requirements of the San Diego Regional Water Quality Control Board, 

 and their presence has created no known problems. 



Sea World Aquatic Park is a unique, privately owned marine ex- 

 hibit located in Mission Bay Park. After filtering to improve clarity, 

 bay waters are used in the exhibit and performance tanks. 



There is a heavy demand for the 1,000 rooms offered by resort hotels 

 in or adjacent to Mission Bay Park. These are largely classified as 

 luxury accommodations. In addition, there are trailer park accom- 

 modations of 653 spaces. Facilities for tourist accommodations are 

 expected to increase, and one hotel is planning to provide an additional 

 127 rooms for visitors as well as additional convention rooms. 



SUMMARY OF CASE STUDY REVIEWS 



Narragansett Bay is an ideal example of an estuary that has devel- 

 oped in an unbalanced fashion. That is, the economic value of the estu- 

 ary at the present time is largely associated with the industrial, 

 military, and transportation uses of its waters. Other uses are, of 

 course, made of the estuary but their economic significance is dwarfed 

 by the tremendous magnitude of the military and commercial uses. 

 However, it must be remembered that this economic measure is merely 

 an indicator of the value of the waters and is not in any way related to 

 the right or necessity of polluting such waters in the process of achiev- 

 ing this value. In fact, the only time that such an economic measure 

 would be used would be for comparing one total use of the estuary to 

 another total use. Of course, it is seldom that questions are so broad as 

 to cover either/or propositions for the entire activity. Rather, the 

 questions usually revolve around such things as the benefits to be 

 derived from reducing pollution caused by users of the estuary com- 

 pared with the costs of achieving the reduction in pollution. 



Franklin County, Fla., is dependent upon pollution-free waters in 

 Apalachicola Bay for its economic existence. The unpolluted waters 

 of the bay provide the seafood caught by local commercial fishermen 

 and processed at shore-based installations. Additional income for the 

 area results from tourism engendered by the bay's waters. 



Both tourism and commercial fishing are prime potential sources of 

 income to any estuarine system. In the case of Apalachicola Bay, these 



