The Aquaponics system serves as a model to teach life science as well as provide valuable nutrients for the garden.  Students...  

WHat is Aquaponics?

aquaponics is a system that uses conventional aquaculture (raising aquatic animals such as fish in tanks) and hydroponics (the process of growing plants in sand, gravel, or liquid, with added nutrients but without soil) in a symbiotic environment

How does it work? 

Water from a pool that has fish in it (tilapia, in this case) is fed to a hydroponic system where the plants break down the nitrification bacteria (fish feces) into nitrates and nitrites, which are used as the nutrients for the plants, and the water is then is recycled back to the aquaculture system.