The high price of feed results in a lack of public interest in developing their business because the profits obtained are less than the maximum and can even be a loss. The aims of this study were to: (1) calculate the costs and income of the tilapia rearing business using a biofloc system with azolla supplementary food in Pulau Panggung Village, Semende Darat Laut District, Muara Enim Regency, …