Pla duk day 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 dan fry averaging 0.1 g each were stocked in six 15-m³ ponds at the following rates: 5,000 fish per pond, 2 ponds; 7,500 fish per pond, 2 ponds; and  10,000 fish per pond, 2 ponds. The fish were fed floating pellet until September 15. Results indicated that average 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 medium stocking level treatment, 91.06, 89, 607.32, 1.49, 53.62; and the high stocking level treatment, 90.73, 85.51, 775.04, 1.24, 80.93. The economic feasibility for small scale culture of this fish was also estimated.