It's been just over 5 years since we started our aquaponics project. In retrospect, I'm glad we did it but I'm not honestly sure of it's value in a sustainable system. These are the challenges I've struggled with over the time we've had the system.
Forums and email lists
If you are interested in adding an aquaponics system, I'd recommend spending some time on this forum. The people on the list are extremely helpful and have a great sense of humor. Be prepared to disappear into the site for long periods of time. The site is based out of Australia but there are members from all over the world.
Building and running an aquaponics system is an adventure. We've had a lot of successes, a few mis-steps and lot of learning along the way.
55 gallon blue barrels buckle
They seem to be an inexpensive way to build a system, however, they have challenges. The buckling means you need to build a good structure to hold them.
I spent the afternoon in the greenhouse making some changes to our aquaponics system. When we initially setup the system, we put two beds above the others. These beds were dedicated to raising duckweed and are setup to be a constant height of water with no other media in the bed. We have had to clean the beds several times since water comes in directly from the fish tank and then settles out in the bed leaving a lot of fish waste in the bottom of the tank. We also have a fingerling tank that is fed directly from the main fish tank and has similar issues.
The water in our aquaponics system has been warming over the last few weeks as spring finally set in. Every few days I look into the water to see if there is any sign of tilapia fry in the tank and this morning, there were. I madly scrambled around and created a home for them. I made a square out of PVC tubing and elbows so it would float and then put that around a pond plant pot to secure the fry from the big bad adults in the system. So far, I've only found three little ones, but I'll keep watching and adding any more I find into the containment area.
Two years ago we built a solar greenhouse. The beauty of the greenhouse has been fresh tomatoes in January, a quiet place to escape and a learning space for gardening and nature. This year we decided we would add an aquaponics system to the greenhouse.