Cage aquaculture is a system in which fish are confined in a rigid enclosure in existing water resources such as lakes, oceans and rivers. This way, it is easy to monitor the fish, feed and harvest them. The cages allow the surrounding water to pass freely between the fish. Strong currents flush through the cages throughout the day, and create favourable conditions for the fish including maintaining the quality of the water and managing waste. The environment mirrors that of wild fish.