Nhu cầu duy trì và hiệu quả sử dụng protein, năng lượng của cá lóc (Channa striata)

Abstract

This study was conducted to determine the requirements for maintenance and efficiency of protein and energy utilization of snakedhead (Channa striata) in order to establish the optimal feed formulation in grow-out of snakehead. In the first experiment, five groups of snakehead with different sizes (10 g; 50 g; 100 g; 200 g and 500 g) were not fed for 28 days to determine protein and energy loss, and protein and energy metabolism exponents. In the second experiment, fish was received the referenced diet under satiate feeding conditions to determine digestibility coefficients of feed and nutrients. The third experiment, fish was fed referenced diet at five different feeding rates: 0%, 25%, 50%, 75% and 100% satiation to evaluate the efficiency of protein and energy utilization. The results showed that protein and energy metabolism exponents were 0.76 and 0.82, respectively. Digestibility of the test diet was 75.1%, while that of protein, energy and lipid was 88.6%, 86.1% and 95.1%, respectively. The efficiency of protein and energy utilization of snakehead was 58.2% and 47.6%, respectively. Digestible protein and energy requirements for maintenance of snakehead were 0.41 g/kg0.76/day and 43.7 kJ/kg0.82/day, respectively.