Aquaponics

[exinilu]

a form of aquaculture (= growing food items such as fish or plants in water) in which the waste produced by fish or other water animals provides food for the water plants, and the plants keep the water clean:

[Tina]

A system of aquaculture in which the waste produced by farmed fish or other aquatic animals supplies nutrients for plants grown hydroponically, which in turn purify the water.