Pla Duk Dan Culture in Circular Concrete Ponds with Water Recirculating System

Abstract

A study was conducted in circular concrete ponds with water recirculating system at the Kasetsart University Aquaculture Department to evaluate the effects of different stocking levels on fish survival, growth, production, feed conversion, and economic returns. On 16 June 1981, pla duk fry averaging 0.1 g each were stocked in six 15-m ponds ; and 10,000 fish per pond, 2 ponds. The fish survival (%), absolute growth (g), production (kg), feed conversion, and economic returns (%), respectively, were as follows : the low stocking level treatment, 79.53, 96.07, 381.49, 1.40, 44.38 ; the low stocking level treatment,91.06,, 89, 607.32, 1.49, 53.62; and the high stocking level treatments, 90.73, 85.51, 775.04, 1.27, 80.93. The economic feasibility for small scale culture of this fish was also estimated.