A couple of years ago I made a visit to the ABLE project in Wakefield to have a look at their aquaponic and hydroponic systems with my sister in law who was considering raising fish as a bussiness venture.
We spent the day with a very knowledgable chap Alberto Deocampo who showed us round and explained the whole set up and how the different systems worked, an excellent set up, but fairly standard as far as hydroponics and aquaponics go with various methods of water flow, filtration and nutrient capture.
One thing we did get to see was an experimental system that Alberto was trialling which was a green water system for raising grass carp which did away with water pumps and filters and was a close loop system
It relied on constant aeration to keep the water oxygenated and moving. Working along the lines of the fish were given a small amount of food a day (1 cup full) their waste fed green algae in the water, which in turn fed micro flora and hence a food chain back to the fish, the tank was round and about 3-4m across and absolutely full of dinner plate sized fish, the system was reliant on sunlight to feed the algae, the whole setup was inside a large building with a clear roof. Of all the systems I've seen it was the one I would love to trail on a small scale in my back garden it has the potential to produce a large amount of high food value in a very small space.
It's on my to do list anyway
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