Aquaculture (i.e. aquatic plants and animals) is North America's third largest import, only following automobiles and fuel. However, we have managed to overfish our environment beyond repair. Overfishing poses an enormous threat to our oceanic ecosystems. Enter urban aquaculture, or more simply put: fish farming in the city. Because urban aquaculture raises their fish rather than collecting them in mass quantities from their natural habitat, it provides an opportunity for fish levels and ecosystems to return to a healthier state. Professor Martin Schreibman, distinguished Professor Emeritus of Biology at Brooklyn College, has developed a state-of-the-art, sustainable urban aquaculture facility. His aquaculture utilizes a water re-use system. Fish waste is filtered out and is used as a plant fertilizer, so ultimately, he is self-sustainably harvesting 2 types of crop -- fish and plants.