Aquaponics /ˈækwəˈpɒnᵻks/, refers to any system that combines conventional
aquaculture (raising
aquatic animals such as snails,
fish,
crayfish or
prawns in tanks) with
hydroponics (cultivating plants in water) in a
symbiotic environment. In normal aquaculture,
excretions from the animals being raised can accumulate in the water, increasing
toxicity. In an aquaponic system, water from an aquaculture system is fed to a
hydroponic system where the
by-products are broken down by
nitrification bacteria into
nitrates and
nitrites, which are utilized by the plants as
nutrients, and the water is then recirculated back to the aquaculture system.