Explanation:

Aquaponics is one of the method to grow the plants/leafy vegetables. The method combines aquaculture — cultivating fish and other aquatic animals in tanks — with hydroponics, where plants are cultivated in water. The water from the fish tank is pumped onto the beds where plants grow. While the fish excretions provide nutrients for the plants, the clean water is recirculated back to the fish tank. While the initial cost to set up the facility would be high, the recurring cost is low in aquaponics and there are two sources of revenue: fish and vegetables.