From what I have read about aquaponics, it can be adapted to about whatever size you want it to be. There are plans online for ones that can be used in the house, to much larger ones that come with their own green house; depending on what your climate is like, and whether you want to grow produce year around, or just in the normal growing season.
With the price of meat going up more and more every day, if people do not make some modification in their eating habits, they will be spending most of their paycheck just to keep food in the house.
We have not normally eaten that kind of quantity of fish either, but many cultures who live near the ocean have depended on fish for their meat for many, many years.
Not only that, but if a person has a nice-sized back yard, they could also turn this into a great little home-based business ! !
Here is one video that does a good job of explaining how aquaponics works, and how to set one up.