To rear aquatic animals and cultivate plants by liquid circulation using cultivation beds arranged in two or more stages, and to provide a closed plant cultivation system. This aquaponics system is provided with a raising tank as a raising system and cultivation beds as a cultivation system. In the cultivation system, the cultivation beds are arranged in two or more stages in the vertical direction. The aquaponics system is provided with a raising/cultivation circulation system which supplies a liquid in the raising tank to each cultivation bed and returns the liquid in the cultivation beds to the raising tank to cause raising tank-to-cultivation bed-to-raising tank circulation. The liquid circulating in the circulation path allows aquatic animals to be raised in the raising tank and plants to be cultivated on the cultivation beds. The aquaponics system may be provided with both a cultivation circulation system for water tank-to-cultivation bed-to-water tank circulation and a raising circulation system for raising tank-to-cultivation bed-to-raising tank circulation.〔課題〕 使栽培床為二段以上，在液體循環中進行水產類之飼育與植物栽培。使植物栽培系統為閉鎖型。 〔解決手段〕 具備有飼育系統之飼育槽與栽培系統之栽培床，栽培系統是將栽培床朝鉛直方向配置二段以上，並將飼育槽內之液體供給至各個前述栽培床，使各個栽培床內之液體回到飼育槽，具備有循環為飼育槽－栽培床－飼育槽的飼育栽培循環系統，藉由循環於前述循環路徑的液體，可在飼育槽內飼育水產類，在栽培床中栽培植物。也可設置循環為貯水槽－栽培床－貯水槽的栽培循環系統、與循環為飼育槽－貯水槽－飼育槽的飼育循環系統雙方。
