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aquaculture water change instead of aquaponics

Posts: 1559
Location: Denver, CO
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I'm thinking that it might just be easier to have a big tank of fish with an air bubbler, and some aquatic plants. Then take five percent of the tank volume per day, water in ground or wicking bucket vegetables, and replace the water. That would get around all the pumping and piping for an aquaponics system, since most people with an aquaponics system still have an in ground or in container garden.

Wouldn't this simplify life?

Or am I missing something?

Of course, aquaponics is just cool!
Posts: 2694
Location: Central Texas zone 8a
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Nothing wrong with that idea. I use a stock tank for the same, with a water hose connected to the drain on bottom. Getting bottom water prob gets more fish poo and stuff out of the tank. The only thing I want to add is a stock tank auto fill thingy piped into a rainwater tank so it fills by itself. Assuming both tanks are in same room I can use more of the fertilized water without an abrupt temperature change
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Location: Elizabeth City, North Carolina - Zone 8a - Humid
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That should totally work if done right. I myself keep wondering why folks who already have fish tanks don't just remove the lid and put in a floating raft with 2" pots on top. The fish like living in darker conditions anyways. If the tank were placed somewhere sunny it would need some covering on the sunny sides to keep algae back.

Also, I would recommend getting one of the bubbler tubes that attaches to a raised screen that sits under all of the gravel in the fish tank!!! As the bubbles rise in the tube they create water flow that can be aimed to create a current/water movement in the tank (which is both good for the fish and the root zones). Entirely eliminating the need for a water pump/filter since the oxygenated water will be slowly pulled down through the gravel and provide the perfect environment for those nitrifying bacteria. Making the fish waste more bio available for the plants... and not as harmful for the fish.

Without this oxygenated environment the gravel will become anaerobic. The anaerobic bacteria will actually turn the ready made bio-nutrients back into their original state. Which is not as much food for the plants and is also toxic to the fish.

There are plenty of aquaponics folks who have a full blown aquaponics system... and use the water from their system to water either trees... their garden... or wicking beds. I recommend looking up wicking beds since they are as water wise as aquaponics and are essentially chinampas with a modern day tech. twist. The tech. being just drainage pipe run under the bed and a water liner to keep water and nutrients from leaching away from the sub-soil. The drainage pipe acts as both a water reservoir and a way too aerate the soil. So you have to leave room for air in there.

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