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doesn't take a lot of space. we looked at a setup in CA, might buy the basics from the guy. the smallest system is made up like this:
a 6'x12' table height growing area (lined planting area with a gravel bed, 6"deep about ) with the top of the bed about hip high
a 4'x4'x2.5' high fish tub with a lid, 1/2 the tank tucked under the planting area so only 2 feet stick out
a 2'x2'x4' high settling tank.
a trellis suported above the growing area to string up top heavy plants.
add a couple of feet around the whole thing and you're maybe 16'x10' total area inside the greenhouse.
the gravel planting bed can be densely planted with tomatos, corn, green onions, peppers, herbs, lettus, zucs and squash... basically anything that isn't a root vegetable. there are a few things that don't thrive, but most of what they've tried has grown lushly. it's such a high nutrient environment that everything just goes gangbusters.
it's a system I *want* <whimper>
oh, and the same size fish tank and settling tank will support a 6' wide bed more than 40' long...
not to mention it produces pounds and pounds of tilapia.
the tilapia eat miscelaneous chopped greens, duckweed or koi-type food. if you want to grow your own duckweed, a couple of kiddy pools of it are all you need... and I'm thinking, properly arranged, they could be under the growing bed table, if you mounted grow lights underneath it.
Any pictures or links to what you are describing. This is new to me and I would love to see how it works.
I am also a subscriber to this thread!
these are the folks I'm familiar with
http://www.portablefarms.com/
they have a turnkey system, or you can buy a kit of the critical items and build/supply the rest yourself. it's not the cheapest system out there but I've seen their operation and it produces oustanding veges, big fish, and is sustainable with very little weekly maintenance once it's set up (one of my criteria). plus they've got a roster of clients that includes both the smallest home installations and rather large commercial installations, so it's successfully scaleable. I've met Colle Davis, the inventor/designer of this system, he's one of those slightly eccentric inventor types and very generous with his knowledge.
if you search on aquaponics you'll turn up other systems as well.