179 



ing of the U.S. naval repair facility in 1964. The building and repair 

 of naval vessels is now a major industry using the bay as a resource. 



Fishing.— SsiB. Diego Bay services the world's largest annual tuna 

 catch. It is estimated to represent approximately 45 percent of the 

 total world catch and to have a value of $21.7 million. The number of 

 persons annually employed in fishing in the San Diego area has de- 

 creased by almost half since 1950, from 2,050 to 1,100. This is expected 

 to remain stable at approximately 1,300 for the projected years of 

 1975, 1980, and 1990. The fishing industry now provides about 0.2 per- 

 cent of the county's employment. 



Fish canneries in the San Diego Bay area are primarily engaged m 

 the processing of tuna caught by a 100-boat fleet operating out of the 

 bay. More than 4 million oases are processed annually by the five can- 

 neries located in the area. Thawing and fluming of fish is done on the 

 bay shore. 



San Diego Bay serves as a refuge, feeding, and nursery area for fish. 

 As such, it effectively influences the fishery resources of the sur- 

 rounding ocean. Approximately 100,000 persons, 80 percent from out of 

 town, fish from commercial fishing boats which operate out of San 

 Diego Bay. 



Fish and animal reduction. — In fish and animal reduction, solid 

 and liquid wastes from fish canneries and solid wastes of animal origin 

 are processed for oil and grease. The remaining solids are dried and 

 converted to chicken feed. 



Animal entrails originally washed with bay water are now flushed 

 with fresh water ; however, a cooker and drier fumes washer is oper- 

 ated with water from San Diego Bay. 



Kelp. — There is an abundant supply of kelp in Pacific Ocean offshore 

 waters. Its chief value is as a source of iodine. The San Diego Bay area 

 is a natural location for the kelp-processing industry. 



Chemical industry. — The San Diego unified port district operated 

 an oil separation unit at its 10th Avenue marine terminal for proc- 

 essing ballast and bilge water of ships using district facilities. The 

 unit has a capacity of 1 million gallons per day, but has been used 

 intermittently and far below its capacity. 



Manufacturing. — Manufacturing is the largest civilian, nongovern- 

 mental component of the economy of San Diego County. It is largely 

 dependent on aircraft and ordnance production. In 1967, 32,200 of the 

 county's 61,700 manufacturing employees (or slightly over 50 percent) 

 were in aircraft and ordnance. The total manufacturing payroll for 

 1967 was over $496 million. 



Trade {wholesale and retail). — In 1967, total annual wages in 

 the trade-industrial category were approximately $339 million, or 24 

 percent of the total San Diego County civilian payroll. From 1960 

 to 1967, the wholesale-retail trade payroll increased 151 percent, with 

 the greatest increase occurring between 1965 and 1967. Trade repre- 

 sents the second largest civilian payroll category in San Diego County, 



Tourism. — The third largest industry in San Diego is tourism. Esti- 

 mated total visitor expenditures have increased approximately 50 per- 

 cent between 1960 and 1967, with the sharpest rise occurring during 

 the 1965 to 1967 period. In addition to bay cleanup, opening of the 

 San Diego Convention Center in 1965 undoubtedly influenced this 

 increase. 



