An aquaculture system is provided. The aquaculture system includes a cultivation pond, a water circulation unit, a water quality detector, and a water processing module. The cultivation pond for storing the cultivation water has a recirculation inlet and recirculation outlet. The water circulation unit is in fluid communication with the cultivation pond to allow the cultivation water in the cultivation pond to circulate through the water circulation unit. The water quality detector is used to detect the quality of the water to obtain water quality information. The water processing module includes an electrolytic gas generator and a control unit to improve the quality of water. The control unit receives the water quality information and adjusts the applied voltage on the electrolytic gas generator according to the water quality information to control the gas species and a ratio of the gases generated by the electrolytic gas generator.