Combining the two methods of food production is a clever way of reducing some of the costs of each.
As food production by necessity begins to benefit from increased localization, things like this offer potential shortcuts.
Aquaponics is the combination of aquaculture (fish farming) and hydroponics (growing plants in water only), in a carefully designed, hyper-productive closed-loop system. There is no pesticide, no fungicide, no fertilizer, no watering the garden, no bending down to weed the garden, and you produce food year round, no matter the climate or soil conditions. This can work in the Sahara Desert or in Antarctica.
Using this system, each 25 SF of grow space can feed one adult 25% of their protein and all of their table vegetables, year round, forever! On-site local food production is the ultimate form of food storage.