Rice bran as an energy-rich supplementary feed in a fertilized system for nile tilapia
1989
Xin Zhang
Potential of rice as a supplementary feed in fertilized tanks for Nile tilapia (Oreochromis niloticus) was assessed. Optimal loading levels of fertilizers (urea and TSP) and buffalo manure were applied to the system based on a previous study. (Urea, 5.4 kg/ha/day; TSP, 0.99 kg/ha/day; buffalo manure, 50 kg/ha/day). Six different feeding levels of rice bran with three replications were used: 0.0, 0.5, 1.0, 2.0, 3.0 and 4.0 % of fish body weight/day. Although different feeding levels of rice bran were applied, there was no significant difference (P0.05) in fish growth performance. However, there was a trend that higher feeding levels led to higher fish yields. The range of the mean value of algal biomass for all treatments was 0.9-1.2 mg/l with no significant differences (P0.05) among the treatments, which indicated that phytoplankton was enough for fish growth and that it was unnecessary to add high-energy supplementary feed in this system at the stocking density used. However, higher rice bran feeding levels led to a higher fat content in final fish carcass composition, which increased the energy source in the fish body
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