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I was totally surprised to see no one had, let alone started a topic on, but even mentioned the word aquaponics! Well, that's fixed. 
So what is Aquaponics?
Quite simply aquaponics is a combination of two existing systems, aquaculture (raising small aquatic animals such as fish, snails or prawns) with hydroponics (cultivating plants in water). The "dirty" nutrient rich water from the aquaculture system feeds the hydroponics system, where the plants filter the water and return "clean" water back to the aquaculture system to complete the cycle. In real terms, this is as close as possible to simulating a full eco-system where flora and fauna compliment each other.
Well that's out of the way, so how does that work in a backyard way? The above sounds pretty complicated. Well for the backyard, there is an easy way to setup a cheap aquaponics system. Let's go through it.
I'm a Cub Scout leader, and this term we're focusing on Our Environment as the term theme. As part of that, we are examining (amongst many other things) plants. Last Monday at our weekly Cub meeting, we setup an aquaponics system in the hall to investigate and watch how a simulated eco-system works.
We broke the project into two components, the aquatic section and the plant section. Water from the aquatic section must feed the plant section, which must return filtered water back to the aquatic section. The aquatic section therefore needs a pump to move water from the tank to the pots. And if we elevate the pots above the tank and have holes in the bottoms of the pots, the water will return to the tank. And that's our basic system.
- 1 big black tub (fish tank)
- 4 gold fish (and fish food)
- 1 water pump (pond pump really)
- 2 pots (use the ones with the built in side water holes)
- growing media (something course like coir or pellets to filter the water and hold root systems is best)
- plants!
So the Cubs setup the system described above, and here is the system ready to operate.
Anyone else experimented with aquaponics?
I'll keep posting updates.
@Jason, it seems kinda expensive at almost $700 for just the 2 trays & the UV pump alone. 
Also, UV in aquaponics seems to be a hotly debated topic:
Closer than what Bob has to what I can get away with.
For fish as a prototype I am limited to Shubunkin or Comets.
Koi are baned here and the area is too small anyway for them.
Water lilies in the pond and dwarf Cana Lilies in grow tubs with some swamp plants, larger Canas in pots around the pond.
UV filter saves the asian mum reaction to green water spoiling the view.
Apologies @Brad, I was stuck in fish for tucker type Aquaponics mode, & hadn't put the pieces together that a relaxating aquarium could also nourishes plants. 
How big an aquarium are you planning, & how many fish?
Well Done @Dale .... I'm trying my hand at hydroponics atm as my garden soil is not going too well, keep up the good work Cheers Jo 
