A multi-layered aquaponics system and an aquaponics cultivation method in an indoor vertical farming application are disclosed. The aquaponics cultivation method of the multi-layered aquaponic system involves using a submersible pump to drain water (through a supply pipe) from a fish tank, located at the lowest level, to each layer of plant grow-bed. When water in one particular grow-bed is filled up to the height of a standpipe of a Bell Siphon, water would drain automatically into a water drain pipe, which circulates back to the fish tank. The strong water current deploying at least one Bell Siphon in a vertical structure will give suitable aeration into the fish tank and emit no carbon by saving power in the aeration system.
