109 



Marsh, Brent Luther. 

 1973. 



Techniques for design of large-scale systems. 

 Ph. D. thesis, Univ. Del., Dep. Mech. Aero. Eng, 223 pp. 

 The primary concern is the presentation of methods developed to 

 optimize large systems with stochastic properties, to select from 

 among the many large-system variables the ones requiring design 

 work and optimization, and to do this selection using computer 

 language notation. Application is to a hypothetical, closed- 

 environment oyster production system with output of 100,000 

 bushels annually, and average cost is reduced from about $49 to 

 $22 per bushel. Three kinds of uncertainty are considered, 

 namely in design variacles, parameters, and functional 

 relationships. Sensitivity analysis is used to isolate aspects 

 of the system requiring design work, given some reasonable &ase 

 design, and the least sensitive variables or aspects of the 

 system are then "fixed," allowing design work to be concentrated 

 on the smaller "dominant problem" (p. 90) . The often obscure 

 nature of computer-language equations is overcome by the use of a 

 print-out matrix (rows represent equations; columns, variables). 

 Subject descriptors: 

 Oysters; closed system culture; systems analysis; costs. 



110 



Mason, J. 



1972. 



Mollusc culture in Scotland. 



World Fish. 21 (9): 42-44. 



Extensive beds of oysters once existed in Scottish waters, but 



they have diminished for several reasons. Because of market 



demand, new methods are beinq developed to culture both oysters 



and mussels. Rather than the native oyster Ostrea edulis, 



Crassotrea qiqas is beinq emphasized, with output of 1 million 



seed oysters per month. Cultural techniques have been adapted 



from those used in other countries for mussels, and the 



difficulty of rearinq natural larvae means that dependence is 



placed on natural spat fall. (Based on ASFA abstract.) 



Subject descriptors: 



Scotland; oysters; mussels; qeneral description. 



111 



Matthiessen, Georqe C. 



1970. 



A review of oyster culture and the oyster industry in North 



America. 



Woods Hole Oceanoqr. Inst., Contrib. No. 2528, 52 pp. 



The conclusion section reviews several factors which account for 



past and prospective proqressive development of oyster culture. 



The report has sections on eiqht qeoqraphical areas of the North 



American continent. Each section discusses species grown. 



50 



