Rearing of fish and shellfish and cultivation of a plant are performed during liquid circulation through use of cultivation beds in two or more stages. A plant cultivation system is a closed type plant cultivation system. Provided is an aquaponics system including a rearing tank of a rearing system and cultivation beds of a cultivation system, in which the cultivation beds of the cultivation system are arranged in two or more stages in a vertical direction. The aquaponics system includes a rearing and cultivation, circulating system in which a liquid in the rearing tank is supplied to each of the cultivation beds, and the liquid in each of the cultivation beds is returned to the rearing tank, to thereby circulate through the rearing tank, the cultivation beds, and the rearing tank. Fish and shellfish can be reared in the rearing tank and a plant can be cultivated in the cultivation beds, with the liquid circulating through the circulating path. Both a cultivation circulating system in which the liquid circula
