Climate change poses a severe threat to food production, making it imperative to find sustainable methods. One such method is aquaponics, which grows fish and vegetables together. Now, Ben-Gurion University of the Negev water researchers have offered a proof of concept for a new closed loop system that produced more fish and vegetables while using less energy than conventional systems.
If I were building these, I would make several medium/small size systems, with different crops and fish. such that in event of a failure not all systems would break down.
When dealing with fish, a bigger system with more water is usually more stable.