A technology demonstration of the semi-intensive culture of the prawn (Penaeus monodon), was conducted at the BFAR National Brackishwater Aquaculture Technology Research Center, Pagbilao, Quezon, from December 1986 to November 1989. An earthen pond with an area of 7,000 sq. m was used. It was stocked with hatchery-bred prawn fry (PL18 – PL20) at increasing rates of 42,800/ha; 61,700/ha; 62,300/ha and 68,600/ha in four successive cropping periods. The prawns were cultured for an average of 138 days and fed with commercial pellets. Their production, growth rate, survival rate, net income and return on investment (ROI) were analyzed and compared.
Growth rate of prawns at the lowest stocking rate (42,800/ha) was the highest at 0.41 g/day. However, production was lowest at this stocking rate. Survival rate varied from 38% to 93%. Profit was highest on the third crop which obtained the highest survival rate.