There are many wonderful experiments going on all around us with hydroponics, with the view to feeding the people of the world when conventional methods start failing us.  I love this article combining fish and vegetables and urge you to read further at posted link:

“Growing fresh fish and vegetables in the Sonora Desert’s 110-degree weather has never been easier.

Through aquaponics, Jason Licamele, a doctorate candidate at the University of Arizona, is growing tilapia and fresh vegetables in a closed water system that operates year round.

In four separate 350 gallon tanks Licamele farms tilapia in Tucson. Waste water is pulled from those tanks and sent through mechanical and biological filters before being mixed with minimal organic nutrients to water the plants he is growing in an adjacent greenhouse room. The plants pull necessary nutrients out of the water and the water is returned to the tanks with the fish.

Jason Licamele adds the fuel to his system, fish food. Through hydroponics he can grow 32 heads of lettuce per square meter.”

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