tables and text in the section on comparative analysis of 



recreational enterprises (pp. 24-45) , and a shorter section is 



devoted to factors to consider in establishing or changing an 



enterprise. 



Subject descriptors: 



Recreation; fee fishing; survey data; revenue; costs; returns; 



sccio-economic data. 



232 



Palfreman, D. A. 



1973. 



The economics of marine fish farming. 



Fish Farming Internatl. 1(1): 47-52. 



Preliminary economic analyses have been made by the British White 



Fish Authority. The basic objectives and methodological 



considerations are described briefly. The purpose is to guide R 



8 D to cost-critical areas, so only partial cost estimates are 



made, disregarding non-critical aspects of cost. 



Subject descriptors: 



Economic concepts; methodology; evaluation. 



233 



Palmer, H. V. R., Jr. 



1974. 



Biologist finds sewage, aguaculture compatible. 



Natl. Fisherman, 55(2): 12-B. 



Progress is described in the experimental development of a system 



to produce clean water from secondarily-treated sewage and to 



provide food for shellfish and finfish under culture conditions. 



This concerns work by Dr. John Ryther, marine biologist, Woods 



Hole Oceanographic Institution, Mass. An expanded operation was 



begun in fall, 1973, with 6 ponds (each holding 36,000 gal. 



seawater-sewage mixture containing about 2/3 sewage) , capacity of 



100,000 gal. sewage per day, algal output of eguivalent volume, 



and capability of serving a city of about 500,000 people. The 



experimental system is of interest to sanitary engineers for 



tertiary sewage treatment. Oysters and guahogs feed on the 



algae, and abalone feed on Irish moss. The algae and moss depend 



in turn on the nutrients in the sewage-seawater mixture. 



Seaworms (Capitella) and bait worms (Nereis) feed on the oyster 



and guahog droppings, respectively, and serve as feed for 



finfish. Viruses from the sewage are an obstacle, but the system 



can also be operated using commercial fertilizers as a nutrient 



medium in place of sewage. 



Subject descriptors: 



Sewage effluent use; experiment; technigues; state of the art; 



mollusks; finfish. 



107 



